Patent Publication Number: US-11050943-B2

Title: Electronic apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a divisional of application Ser. No. 16/228,970, filed Dec. 21, 2018, the entire disclosure of which is hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to an electronic apparatus that outputs HDR images to an external apparatus that can display HDR. HDR stands for high dynamic range, and refers to a dynamic range that is wider than standard dynamic range (SDR). 
     Description of the Related Art 
     The screens displayed on a display apparatus include a screen where a graphic representing image information (OSD) is superimposed on an image, a menu screen which includes only graphics for the setting menu and the like. Japanese Patent Application Publication No. 2010-268332 discloses a technique to display an OSD superimposed on an HDR image. 
     Japanese Patent Application Publication No. 2002-325198 discloses a technique to display a main image first and then display a reduced image (e.g. thumbnail) when an instruction to display the next image is received within a predetermined time. 
     There is an electronic apparatus that acquires histogram information representing the frequency distribution of brightness (brightness histogram) from a captured image, and outputs the image and the histogram information to an external apparatus (such a display apparatus as a liquid crystal monitor) to display this image and histogram information. By referring to the histogram information, the user can determine whether exposure of the image is appropriate, or whether imaging conditions are appropriate, for example. 
     An available method of outputting an image to an external apparatus includes a method of performing conversion processing to convert an image into an HDR image having a wide dynamic range, and outputting the HDR image to an external apparatus (HDR image output). Since the conversion processing is performed, the histogram information acquired from the HDR image is different from the histogram information acquired from the image before the conversion processing. HDR stands for high dynamic range, and refers to a dynamic range that is wider than the standard dynamic range (SDR). 
     Japanese Patent Application Publication No. 2006-33089 discloses a technique to perform correction on the histogram information after image processing to bring the information closer to the histogram information before the image processing, so that the histogram information that is close to the exposure conditions during imaging can be acquired. 
     When an image is outputted to an external apparatus, in some cases the connection mode must be switched depending on the image (content) to be outputted. If the connection mode is switched, it may take time until the external apparatus becomes ready and displays the image. The electronic apparatus that outputs the image to the external apparatus, on the other hand, cannot determine the timing when the external apparatus displays the image. Therefore if a moving image is reproduced while switching the connection mode, the initial portion of the moving image may not be displayed on the external apparatus, and the user may not see this initial portion. 
     Japanese Patent Application Publication No. 2003-110563 discloses a technique to output invalid data to an external apparatus when the connection mode is switched, and repeatedly check the state of the external apparatus, so that when the external apparatus is ready, the output of the invalid data is stopped, and output of the moving image is started. 
     SUMMARY OF THE INVENTION 
     However, in the case of the HDR display, white may be displayed at a very high brightness. In the case of a screen that is not a natural image, such as a menu screen, bright white is often used as the color for characters, icons, background and the like. Therefore if a screen that is not a natural image is displayed in HDR, the white of the screen may be too bright, and the user may experience an unintended glare. 
     HDR image output is not disclosed in Japanese Patent Application Publication No. 2002-325198. In the case of HDR image output to display an ideal HDR image based on a RAW image on an external apparatus, processing such as reading the RAW image or developing the RAW image is required. Since the processing takes time, time is required to display an ideal HDR image, and until then, the user cannot view the image under ideal (comfortable) conditions. This problem is conspicuous in the case of displaying a plurality of HDR images corresponding to a plurality of RAW images respectively by switching. 
     In some cases, images, which are generated from the same original image but which have different gradation resolution and color gamut from one another, may be displayed. For example, this is the case when an SDR image, generated form a RAW image, is displayed on the rear face monitor of a digital camera, and an HDR image, generated from the same RAW image, is displayed on an external monitor connected to the digital camera. 
     Here it is assumed that the histogram information acquired from the SDR image is displayed together with the HDR image on the external monitor. In this case, it can be determined from the histogram information that the gradation of a bright portion has been lost, but the gradation of the bright portion remains in the HDR image, and this mismatch may cause discomfort to the user. 
     Then it is assumed that the histogram information is acquired from the HDR image and the acquired histogram information is displayed together with the HDR image on an external monitor. In this case, even if the gradation of the bright portions is near the limit in the SDR image, for example, the user may increase the exposure of the digital camera, determining that the gradation of the bright portion can still be increased based on the histogram information. As a result, the gradation of the bright portion is lost, and an image may be captured at an untended exposure. 
     This problem is not solved even if the histogram correction is performed according to Japanese Patent Application Publication No. 2006-33089. Beside a histogram, a similar problem occurs when information related to at least one of brightness, gradation and tinge is displayed. In other words, in the case of displaying images which are generated from the same original image, but have different gradation resolution and color gamut from one another, the user may experience discomfort or misunderstanding may occur because of the display of information related to at least one of brightness, gradation and tinge, which may result in an inappropriate operation and imaging. 
     In the case of the technique according to Japanese Patent Application Publication No. 2003-110563, it must be detected that the external apparatus is ready. However, this detection may be difficult depending on the external apparatus. If readiness of the external apparatus cannot be detected or is detected in error, the reproduction of the moving image cannot be started at an ideal timing, and the moving image cannot be displayed appropriately. 
     A first aspect of the present invention provides a technique to display various screens appropriately. A second aspect of the present invention provides a technique to display an image appropriately even if this image is a specific type, such as a RAW image. A third aspect of the present invention provides a technique to minimize misunderstandings of the user caused by a display of information related to at least one of brightness, gradation and tinge. A fourth aspect of the present invention provides a technique to display moving images on an external apparatus appropriately, regardless the type of external apparatus. 
     An electronic apparatus according to the present invention, includes: 
     a connector configured to connect with an external apparatus; 
     a memory; and 
     at least one processor and/or at least one circuit to perform the operations of the following units: 
     a setting unit configured to set a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than a first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted; and 
     a control unit configured to control so that in a case where the connection is in the second connection mode and an instruction to switch a first screen including a captured image captured by an image sensor to a second screen not including a captured image is received, the set connection mode is switched from the second connection mode to the first connection mode, and the second screen is outputted from the connector. 
     According to the first aspect of the present invention, various screens can be appropriately displayed. According to the second aspect of the present invention, an image can be appropriately displayed even if this image is a specific type, such as a RAW image. According to the third aspect of the present invention, misunderstandings of the user caused by the display of information related to at least one of brightness, gradation and tinge can be minimized. And according to the fourth aspect of the present invention, moving images can be appropriately displayed on an external apparatus, regardless the type of external apparatus. 
     Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A and 1B  are external views of a digital camera according to the embodiment; 
         FIG. 2  is a block diagram depicting a configuration example of the digital camera according to the embodiment; 
         FIG. 3  is a diagram depicting a connection between the digital camera and an external apparatus according to the embodiment; 
         FIG. 4  is a flow chart of the digital camera according to the embodiment; 
         FIGS. 5A to 5D  are flow charts of the digital camera according to the embodiment; 
         FIG. 6  is a flow chart of the digital camera according to the embodiment; 
         FIG. 7  is a flow chart of the digital camera according to the embodiment; 
         FIGS. 8A and 8B  are flow charts of the digital camera according to the embodiment; 
         FIG. 9A  is a flow chart of the digital camera according to the embodiment, and  FIG. 9B  is a graph indicating a y curve according to the embodiment; 
         FIG. 10  is a screen example of the digital camera/external apparatus according to the embodiment; 
         FIG. 11  is a screen example of the digital camera/external apparatus according to the embodiment; 
         FIG. 12  is a screen example of the digital camera/external apparatus according to the embodiment; 
         FIG. 13  is a screen example of the digital camera/external apparatus according to the embodiment; 
         FIGS. 14A and 14B  are flow charts of the digital camera according to the embodiment; 
         FIGS. 15A to 15C  are screen examples of the digital camera/external apparatus according to the embodiment; 
         FIGS. 16A and 16B  are flow charts of the digital camera according to the embodiment; 
         FIG. 17  is a flow chart of the digital camera according to the embodiment; and 
         FIGS. 18A and 18B  are screen examples of the digital camera/external apparatus according to the embodiment. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Configuration 
     Preferred embodiments of the present invention will be described with reference to the drawings.  FIGS. 1A and 1B  are external views of a digital camera  100 , which is an example of an apparatus to which the present invention can be applied.  FIG. 1A  is a front perspective view of the digital camera  100 , and  FIG. 1B  is a rear perspective view of the digital camera  100 . 
     A display unit  28  is a display unit which is disposed on the rear face of the digital camera  100 , and displays images and various information. A finder outer display unit  43  is a display unit which is disposed on the upper surface of the digital camera  100 , and displays various set values of the digital camera  100 , including the shutter speed and aperture stop. A terminal cover  40  is a cover that protects connectors (e.g. connection cables) that connect the digital camera  100  to an external apparatus. The connectors include a communication terminal (not illustrated) of a USB cable, and an output I/F  91  (mentioned later), which is an HDMI (registered trademark) output terminal. A quick return mirror  12  can be moved up/down by an actuator (not illustrated), based on an instruction from a system control unit  50  (mentioned later). A communication terminal  10  is a communication terminal for the digital camera  100  to communicate with a lens unit  150  (mentioned later: detachable). An eyepiece finder  16  is a viewable type finder to confirm the focal point and composition of the optical image of the object, which is acquired via a lens unit  150 , by observing a focusing screen  13  (mentioned later). A cover  202  is a cover of a slot where a recording medium  200  (mentioned later) is stored. A grip unit  90  is a holding unit having a shape for the user to easily hold the digital camera  100  with their right hand. 
     The digital camera  100  also has a mode select switch  60 , a shutter button  61 , a main electronic dial  71 , a power switch  72 , a sub-electronic dial  73 , a four-direction key  74 , a SET button  75  and an LV button  76 . The digital camera  100  also has a zoom-in button  77 , a zoom-out button  78 , a playback button  79 , a touch panel  70   a , an auto focus (AF) ON button  70   b , a quick setting button  70   c  (Q button  70   c ), and an active frame select button  70   d . The digital camera  100  also has a menu button  70   e , a function button  70   f , and an information button  70   g . The digital camera  100  may include other operation members. Each of the above mentioned operation members will be described later. 
       FIG. 2  is a block diagram depicting a configuration example of the digital camera  100 . 
     A lens unit  150  is a lens unit that includes a replaceable imaging lens. A lens  103  is normally constituted of a plurality of lenses, but only one lens is simply illustrated in  FIG. 2 . A communication terminal  6  is a communication terminal for the lens unit  150  to communicate with the digital camera  100 , and a communication terminal  10  is a communication terminal for the digital camera  100  to communicate with the lens unit  150 . The lens unit  150  communicates with the system control unit  50  via the communication terminals  6  and  10 . The lens unit  150  controls an aperture stop  1  using an internal lens system control circuit  4  via an aperture stop driving circuit  2 . Further, the lens unit  150  performs focusing by changing the position of the lens  103  by the lens system control circuit  4  via an AF driving unit  3 . 
     An automatic exposure (AE) sensor  17  measures the brightness of the light of the object (object light) via the lens unit  150 . 
     A focal point detecting unit  11  outputs defocus amount information to the system control unit  50 . The system control unit  50  controls the lens unit  150  based on the defocus amount information, and performs phase difference auto focus. 
     The quick return mirror  12  (mirror  12 ) can be moved up/down by an actuator (not illustrated) based on an instruction from the system control unit  50  at exposure, live-view image capturing, moving image capturing and the like. The mirror  12  is a mirror to switch the luminous flux that enters from the lens  103  between the finder  16  side and the imaging unit  22  side. The mirror  12  is normally set to guide (reflect) the luminous flux to the finder  16  (mirror down), but in the case of image capturing or live-view display, the mirror  12  is moved up and retracted from the luminous flux, so as to guide the luminous flux to the imaging unit  22  (mirror up). The mirror  12  is a half mirror, so that the center portion thereof can transmit a part of the light, and allows a part of the luminous flux to transmit so as to enter the focal point detecting unit  11  in order to detect a focal point. 
     The user can check the focus and composition of the optical image of the object acquired via the lens unit  150  by observing the focusing screen  13  through a penta-prism  14  and the finder  16 . 
     A shutter  101  is a focal plane shutter that can freely control the exposure time of the imaging unit  22  by control of the system control unit  50 . 
     The imaging unit  22  is an image pickup element constituted by a CCD, a CMOS element or the like to convert an optical image into an electric signal. An A/D convertor  23  converts an analog signal, outputted from the imaging unit  22 , into a digital signal. 
     Image processing unit  24  performs predetermined processing (e.g. pixel interpolation, resizing processing such as reducing, color conversion processing) on the data from the A/D convertor  23  or the data from the memory control unit  15 . Further, in the image processing unit  24 , predetermined arithmetic processing is performed using the captured image data, and the system control unit  50  controls exposure and distance measurement based on the acquired result. Thereby through the lens (TTL) type AF processing, AE processing, EF (pre-flash emission) processing and the like are performed. Furthermore, in the image processing unit  24 , predetermined arithmetic processing is performed using the captured image data, and TTL type auto white balance (AWB) processing is performed based on the acquired result. 
     The output data from the A/D convertor  23  is written to a memory  32  via the image processing unit  24  and the memory control unit  15 , or via the memory control unit  15 . The memory  32  stores image data which is acquired by the imaging unit  22 , and converted into digital data by the A/D convertor  23  and image data to be displayed on a display unit  28  or on an external apparatus  300  such as an external monitor. The memory  32  has sufficient storage capacity to store a predetermined number of still images, and a predetermined time of moving images and sounds. 
     The memory  32  is also used as a memory to display images (video memory). A D/A convertor  19  converts the data for displaying images, which is stored in the memory  32 , into an analog signal, and supplies this analog signal to the display unit  28 . Thus the image data for display, which is written in the memory  32 , is displayed by the display unit  28  via the D/A convertor  19 . The display unit  28  performs display on the display unit (e.g. LCD) in accordance with the analog signal from the D/A convertor  19 . The digital signal, which was converted by the A/D convertor  23  and stored in the memory  32 , is converted into an analog signal by the D/A convertor  19 , and is sequentially transferred to the display unit  28  and displayed, whereby the function of the electronic view finder can be implemented, and through image display (live-view display) can be performed. 
     On a finder inner display unit  41 , a frame to indicate a distance measuring point where auto focus is currently being performed (AF frame), icons to indicate the setting states of the camera and the like are display by a finder inner display unit driving circuit  42 . 
     On a finder outer display unit  43 , various set values of the digital camera  100 , such as shutter speed and aperture stop are displayed by a finder outer display unit driving circuit  44 . 
     The output I/F  91  supplies the data for displaying images stored in the memory  32  to the external apparatus  300  in the digital signal state. In this way, the image data for display written in the memory  32  is displayed on the external apparatus  300 . 
     A non-volatile memory  56  is a memory that can be erased or recorded electrically, an EEPROM, for example, can be used. The non-volatile memory  56  stores constants and programs for operation of the system control unit  50 , for example. Programs here refers to programs for executing various flow charts described later according to the embodiments. 
     The system control unit  50  is a control unit that includes at least one processor, and controls the entire digital camera  100 . The system control unit  50  implements each processing of the embodiments described later by executing the programs recorded in the above mentioned non-volatile memory  56 . The system memory  52  is RAM, for example, and the system control unit  50  develops the constants and variables for operating the system control unit  50 , programs read from the non-volatile memory  56  and the like on the system memory  52 . Further, the system control unit  50  also performs display control by controlling the memory  32 , the D/A convertor  19 , the output I/F  91 , the display unit  28  and the like. 
     A system timer  53  is a clocking unit that measures the time used for various controls and the time of the internal clock. 
     A power supply control unit  80  is constituted of a battery detecting circuit, a DC/DC convertor, a switch circuit to switch an energizing block and the like, and detects whether a battery is attached, a battery type and residual charge of a battery. Based on the detection result and instruction from the system control unit  50 , the power supply control unit  80  controls the DC-DC convertor and supplies the necessary voltage to each unit, including the recording medium  200 , during a necessary period. 
     A power supply unit  30  is constituted of a primary battery (e.g. alkali battery, lithium battery), a secondary battery (e.g. NiCd battery, NiMH battery, Li battery), an AC adapter and the like. A recording medium I/F  18  is an interface with such a recording medium  200  as a memory card and hard disk. The recording medium  200  is a memory card, for example, to record captured images, and is constituted of a semiconductor memory, a magnetic disk or the like. 
     A communication unit  54  transmits/receives an image signal and sound signal to/from an external apparatus connected wirelessly or via cable. The communication unit  54  can also be connected via a wireless local area network (LAN) or the Internet. The communication unit  54  can send an image (including a through image) captured by the imaging unit  22  and an image recorded in the recording medium  200 , and can receive image data and various other information from an external apparatus. 
     A direction detecting unit  55  detects a direction of the digital camera  100  with respect to the direction of gravity. Based on the direction detected by the direction detecting unit  55 , it can be determined whether an image captured by the imaging unit  22  is an image captured by holding the digital camera  100  in a horizontal position or an image captured by holding the digital camera  100  in a vertical position. The system control unit  50  can add the direction information in accordance with the direction detected by the direction detecting unit  55  to an image file of an image captured by the imaging unit  22 , or can record the image in a rotated position. For the direction detecting unit  55 , an acceleration sensor, a gyro sensor or the like can be used. 
     An operation unit  70  is an operation unit to input various operation instructions to the system control unit  50 . The operation unit  70  includes various operating members which function as input units to receive operation input by the user (user operation). In concrete terms, the operation unit  70  includes the mode select switch  60 , the shutter button  61 , the main electronic dial  71 , the power switch  72 , the sub-electronic dial  73 , the four-direction keys  74 , the SET button  75 , the LV button  76 , the zoom-in button  77  and the zoom-out button  78 . The operating members include the playback button  79 , the touch panel  70   a , the AF ON button  70   b , the Q button  70   c , the active frame select button  70   d , the menu button  70   e , the function button  70   f  and the information button  70   g . Each operating member of the operation unit  70  functions as a specific functional buttons, to which an appropriate function is assigned for each situation by selecting and operating various functional icons displayed on the display unit  28  or the external apparatus  300 . The functional buttons are, for example, an end button, a return button, an image forward button, a jump button, a narrow down button, and an attribute change button. 
     The mode select switch  60  is an operation member to switch between various modes. The mode select switch  60  switches the operation mode of the system control unit  50  to a still image recording mode, a moving image capturing mode, a reproduction mode or the like. Modes included in the still image recording mode are, for example: auto imaging mode, auto scene determining mode, manual mode, aperture top priority mode (Av mode), and a shutter speed priority mode (Tv mode). Further, the still image recording mode also includes various scene modes to set imaging for each imaging scene, a program AE mode and a custom mode. The mode select switch  60  is used to switch the mode to one of these modes. After switching to an imaging mode list screen by the mode select switch  60 , the mode may be switched to one of the plurality of modes displayed in this list using another operating member. In the same manner, a plurality of modes may be included in the moving image capturing mode. 
     The shutter button  61  is an operating member to instruct imaging. The shutter button  61  includes a first shutter switch  62  and a second shutter switch  64 . The first shutter switch  62  is turned ON in the middle of operating the shutter button  61 , that is, in the half depressed state (imaging preparation instruction), and generates a first shutter switch signal SW 1 . The system control unit  50  starts operation of the AF processing, AE processing, AWB processing, EF processing or the like by the first shutter switch signal SW 1 . The second shutter switch  64  is turned ON when operation of the shutter button  61  is completed, that is, in full depressed state (imaging instruction), and generates a second shutter switch signal SW 2 . By the second shutter switch signal SW 2 , the system control unit  50  starts a series of imaging operations: from the reading of the signal from the imaging unit  22  to the writing of the image data to the recording medium  200 . 
     The main electronic dial  71  is a rotational operating member, and by turning the main electronic dial  71 , such an operation as changing the setting values of the shutter speed and aperture stop can be performed. The power switch  72  is an operating member of the digital camera  100  to switch ON/OFF of the power supply. The sub-electronic dial  73  is a rotary operating member, and by turning the sub-electronic dial  73 , such operations as moving the selection frame and image forwarding can be performed. The four-direction key  74  is configured such that each part (top, bottom, left and right), can be depressed. Processing can be performed in accordance with the depressed part of the four-direction key  74 . In this embodiment, the four-direction key  74  is one integrated operating member, but a top button, a bottom button, a left button and a right button may be disposed as independent direction buttons respectively. Herein below, the top or bottom portion is called a “vertical key”, and the left or right portion is called a “horizontal key”. The SET button  75  is a push button, and is mainly used for determining a selected item. 
     The LV button  76  is a button to switch ON/OFF the live-view (LV) in the still image capturing mode. In the moving image capturing mode, the LV button  76  is used to instruct a start or stop of the moving image capturing (recording). The zoom-in button  77  is an operation button to switch ON/OFF the zoom-in mode and to change magnification in the zoon-in mode when live-view display is performed in the imaging mode. In the reproduction mode, the zoom-in button  77  functions as a zoom-in button to enlarge a reproduced image or to increase the magnification thereof. The zoom-out button  78  is a button to reduce the displayed image by decreasing the magnification of the enlarged reproduced image. The playback button  79  is an operation button to switch between the imaging mode and the reproduction mode. If the playback button  79  is pressed in the imaging mode, the mode shifts to the reproduction mode, in which the latest image of the images recorded in the recording medium  200  can be displayed on the display unit  28  or the external apparatus  300 . 
     The touch panel  70   a  detects contact to the touch panel  70   a . The touch panel  70   a  and the display unit  28  may be integrated. For example, the touch panel  70   a  can be configured such that the transmittance of the light will not interfere with the display of the display unit  28 , and can be installed on the upper layer of the display surface of the display unit  28 . Then the input coordinates on the touch panel  70   a  and the display coordinates on the display unit  28  are corresponded to each other. Thereby a graphic user interface (GUI), in which the user can directly interact via the screen displayed on the display unit  28 , can be constructed. The system control unit  50  can detect the operations below when contacting the touch panel  70   a  or can detect the state of the touch panel  70   a.  
         A finger or pen which did not touch the touch panel  70   a  touches the touch panel  70   a  for the first time, in other words, touch is started (hereafter called “Touch-Down”)   A finger or pen is touching the touch panel  70   a  (hereafter called “Touch-On”)   A finger or pen is moving while touching the touch panel  70   a  (hereafter called “Touch-Move”)   A finger or pen, which was touching the touch panel  70   a , is released from the touch panel  70   a , in other words, touch is ended (hereafter called “Touch-Up”)   Nothing is touching the touch panel  70   a  (hereafter called “Touch-Off”)       

     When Touch-Down is detected, Touch-On is detected at the same time. After Touch-Down, normally Touch-On continues to be detected unless Touch-Up is detected. When Touch-Move is detected as well, Touch-On is detected at the same time. Even if Touch-On is detected, Touch-Move is not detected unless the touch position is moving. When Touch-Up of all the fingers and a pen is detected, Touch-Off is detected. 
     These operations, states and the positional coordinates on the touch panel  70   a  where a finger or pen is touching are notified to the system control unit  50  via an internal bus. Then, based on the information that is notified, the system control unit  50  determines which operation (touch operation) was performed on the touch panel  70   a . For Touch-Move, the moving direction of the finger or pen moving on the touch panel  70   a  can also be determined for each vertical component and horizontal component on the touch panel  70   a , based on the change of the positional coordinates. If the Touch-Move of at least a predetermined distance is detected, it is determined that a sliding operation was performed. An operation of quickly moving a finger touching the touch panel  70   a  for a certain distance then releasing is called “flicking”. In other words, flicking is an operation of quickly moving on then releasing the finger from the touch panel  70   a . When Touch-Move for at least a predetermined distance at a predetermined speed or more is detected, and Touch-Up is detected immediately after this, the flicking operation is determined (it is determined that flicking was performed immediately after the sliding operation). Further, a touch operation of touching a plurality of locations (e.g. two points) at the same time and drawing these touch positions close together is called “pinch-in”, and a touch operation of spreading these touch positions apart is called “pinch-out”. “Pinch-out” and “pinch-in” are collectively referred to as “pinch-operation” (or simply referred to a “pinch”). For the touch panel  70   a , any touch panel, of the various types (resistive film type, capacitance type, surface acoustic wave type, infrared type, electromagnetic indication type, image recognition type, optical sensor type) can be used. Either a type of detecting touch by contacting the touch panel or a type of detecting touch by an approach of a finger or pen to the touch panel may be used. 
     The menu button  70   e  is a push button switch, and a menu screen, to set various settings, is displayed on the display unit  28  or the external apparatus  300  by pressing the menu button  70   e . The user can intuitively perform various settings using the menu screen displayed on the display unit  28  or the external apparatus  300 , the four-direction key  74  and the SET button  75 . 
     The information button  70   g  is a push button switch, and is used for switching between various information displays, for example. 
       FIG. 3  is a diagram depicting a connection between the digital camera  100  and the external apparatus  300 . The output I/F  91  of the digital camera  100  and the external apparatus  300  can be connected using an HDMI (registered trademark) cable  302 , which is a connection cable. When an HDMI connection is performed, the light of the display unit  28  of the digital camera  100  turns OFF, and the image displayed on the digital camera  100  is displayed on a display unit (external display unit)  301  of the external apparatus  300 . 
     Reproduction Mode Processing (Main Unit) 
       FIG. 4  is a flow chart depicting the details of the reproduction mode processing performed by the digital camera  100 . This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In S 401 , the system control unit  50  determines whether the digital camera  100  is connected to the external apparatus  300 . Processing advances to S 403  if it is determined that the digital camera  100  and the external apparatus  300  are connected, or to S 402  if not. 
     In S 402 , the system control unit  50  acquires the information on the image to be reproduced from the file of this image. The information to be acquired is metadata (including attribute information), a file name and the like. The file of the image to be reproduced is recorded in the recording medium  200 , and the information on this image is loaded from the recording medium  200  to the system memory  52  using the recording medium I/F  18 . 
     In S 403 , the system control unit  50  performs processing to connect the digital camera  100  and the external apparatus  300 . The connection processing (external connection processing) will be described in detail later with reference to  FIGS. 5A to 5D . 
     In S 404 , the system control unit  50  determines whether the image to be reproduced is a RAW image (image before developing processing) based on the information acquired in S 402  and in the later mentioned S 424  (e.g. metadata and file name of image to be reproduced). Processing advances to S 406  if it is determined that the image to be reproduced is a RAW image, or to S 405  if not. A file of the RAW image, that is, a RAW file, includes a RAW image, a JPEG image for display, a DCF thumbnail image and the like. 
     In S 405 , the system control unit  50  determines whether the image to be reproduced is a JPEG image based on the information acquired in S 402  and in the later mentioned S 424  (e.g. metadata and file name of image to be reproduced). Processing advances to S 407  if it is determined that the image to be reproduced is a JPEG image, or to S 408  if not. The JPEG image here is not a JPEG image for display which is included in the RAW file, but an independent JPEG file. 
     In S 406 , the system control unit  50  reads only the JPEG file for display (accompanying image), which is recorded in association with the RAW image to be reproduced, from the recording medium  200 , and displays this image on the display unit  28 . For example, the reproduction screen  1000  in  FIG. 10  is displayed on the display unit  28 . The reproduction screen  1000  includes a reproduced image  1001  which is displayed based on the JPEG image (JPEG image for display) and an item (icon)  1002  to indicate that a RAW image is being displayed. Various items that can be used are an icon, guidance and the like. The icon  1002  is an icon that indicates the compression rate and the number of pixels (resolution, image size). Since the compression rate is displayed, it can be identified that this image is an image generated by compressing the reproduced image  1001 , that is, this is not an image of a RAW file but an image of a compression-coded image file, such as a JPEG file. 
     In S 407 , the system control unit  50  reads the JPEG file to be reproduced from the recording medium  200 , and displays the image on the display unit  28 . For example, a reproduction screen  1010  in  FIG. 10  is displayed on the display unit  28 . The reproduction screen  1010  includes a reproduced image  1001  displayed based on the JPEG image and an icon  1012  to indicate that the JPEG image is being displayed. 
     In S 408 , the system control unit  50  reads a moving image to be reproduced from the recording medium  200 , and displays the first frame of this moving image on the display unit  28 . For example, a moving image reproduction preparation screen  1850  in  FIG. 18B  is displayed on the display unit  28 . The moving image reproduction preparation screen  1850  includes an image  1851  of the first frame of the moving image, and an item  1852  to instruct the start of reproduction of this moving image. An item that indicates that a moving image is currently being displayed may be included in the moving image reproduction preparation screen. 
     In S 409 , the system control unit  50  performs the operation receiving processing. The operation receiving processing, in the case when the digital camera  100  is not connected to the external apparatus  300 , will be described later with reference to FIG.  14 A. 
     In S 410 , the system control unit  50  performs the moving image display processing. The moving image display processing, in the case when the digital camera  100  is not connected to the external apparatus  300 , will be described later with reference to  FIG. 8A . 
     In S 411 , the system control unit  50  determines whether the user pressed the menu button  70   e . Processing advances to S 413  if it is determined that the menu button  70   e  was pressed, or to S 414  if not. In S 412  as well, the system control unit  50  determines whether the menu button  70   e  was pressed. Processing advances to S 413  if it is determined that the menu button  70   e  was pressed, or to S 415  if not. In S 413 , the system control unit  50  performs the menu processing. The menu processing, in the case when the digital camera  100  is not connected to the external apparatus  300  will be described in detail later. 
     In S 414 , the system control unit  50  determines whether the user half-depressed the shutter button  61 . Processing advances to S 416  if it is determined that the shutter button  61  was half-depressed, or to S 417  if not. In S 415  as well, the system control unit  50  determines whether the shutter button  61  was half-depressed. Processing advances to S 416  if it is determined that the shutter button  61  was half-depressed, or to S 418  if not. 
     In S 416 , the system control unit  50  performs the imaging mode processing. The imaging mode is a mode for performing imaging. By the imaging mode processing, an imaging standby screen  1300  in  FIG. 13 , for example, is displayed on the display unit  28 . The imaging standby screen  1300  includes an icon  1301  to indicate the imaging mode, an icon  1302  to indicate various information that is set in the digital camera  100 , and a live-view image  1303  which indicates the object in real-time. In the imaging processing, the system control unit  50  performs imaging in accordance with the imaging instruction, and automatically switches the display screen of the display unit  28  to an imaging confirming screen (quick review screen) of the captured image acquired by this imaging operation. For example, the imaging confirming screen  1310  in  FIG. 13  is displayed on the display unit  28 . The imaging confirming screen  1310  is a screen to confirm the image captured by the imaging just performed, and includes a reproduced image  1311  of the captured image acquired by the imaging just performed. 
     In S 417 , the system control unit  50  determines whether the digital camera  100  is connected to the external apparatus  300 . Processing advances to S 419  if it is determined that the digital camera  100  and the external apparatus  300  are connected, or to S 420  if not. In S 418  as well, the system control unit  50  determines whether the digital camera  100  is connected to the external apparatus  300 . Processing advances to S 419  if it is determined that the digital camera  100  is connected to the external apparatus  300 , or to S 421  if not. In S 419 , the system control unit  50  performs the later mentioned external connection processing in accordance with  FIGS. 5A to 5D . 
     In S 420 , the system control unit  50  determines whether the user operated the power switch  72  and instructed power off. The reproduction mode processing ends if it is determined that power off was instructed, or processing advances to S 422  if not. In S 421  as well, the system control unit  50  determines whether the user instructed power off. The reproduction mode processing ends if it is determined that power off was instructed, or processing advances to S 423  if not. 
     In S 422 , the system control unit  50  determines whether the user performed the image switching operation using the operation unit  70 . Processing advances to S 424  if it is determined that the image switching operation was performed, or to S 409  if not. In S 423  as well, the system control unit  50  determines whether the user performed the image switching operation. Processing advances to S 424  if it is determined that the image switching operation was performed, or to S 410  if not. 
     In S 424 , the system control unit  50  acquires the information on the image to be reproduced next (e.g. metadata, file name) from the file of this image. 
     External Connection Processing 
       FIG. 5A  is a flow chart depicting details of the external connection processing (S 403  and S 419  in  FIG. 4 ). This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In step S 501 , the system control unit  50  determines whether the external apparatus  300  supports HDR image signals (whether the external apparatus  300  is capable of performing an HDR display). Processing advances to S 502  if it is determined that the external apparatus  300  supports HDR image signal, or to S 504  if not. HDR stands for high dynamic range, and is a dynamic range that is wider than standard dynamic range (SDR). 
     In S 502 , the system control unit  50  determines whether the HDR output setting (a setting to enable output of HDR image signals, that is, a setting to select HDR connection mode in a usual state) is enabled in the digital camera  100 . Processing advances to S 503  if it is determined that the HDR output setting is enabled, or to S 504  if not. The HDR connection mode is a connection mode to output an HDR image. 
     In S 503 , the system control unit  50  sets the HDR connection mode, and performs the reproduction mode processing. The reproduction mode processing, in the case when the digital camera  100  is connected to the external apparatus  300  in the HDR connection mode, will be described in detail later with reference to  FIG. 6 . 
     In S 504 , the system control unit  50  sets the SDR connection mode, and performs the reproduction mode processing. The SDR connection mode is a connection mode to output the SDR images. The reproduction mode processing, in the case when the digital camera  100  is connected to the external apparatus  300  in the SDR connection mode, will also be described in detail later. 
       FIG. 5B  is a sequence diagram depicting a control procedure between the digital camera  100  and the external apparatus  300 , in the case when the digital camera  100  and the external apparatus  300  are interconnected. In the description in this embodiment, it is assumed that the digital camera  100  and the external apparatus  300  are connected by an HDMI connection. 
     In S 511 , the system control unit  50  instructs the output I/F  91  to start transmission of a +5V signal, and the output I/F  91  starts to transmit the +5V signal. The transmitted +5V signal is transmitted to the external apparatus  300  via a +5V signal line (not illustrated) of the connection cable  302 . The external apparatus  300  receives the +5V signal via the connection cable  302 . 
     In S 512 , by reception of the +5V signal, the external apparatus  300  detects that the digital camera  100  is connected via the connection cable  302 . 
     In S 513 , the external apparatus  300  starts transmitting a hot plug detect (HPD) signal to an HPD signal line (not illustrated) of the connection cable  302 . The output I/F  91  of the digital camera  100  receives the transmitted HPD signal via the connection cable  302 . When the HPD signal is received, the output I/F  91  notifies the reception of the HPD signal to the system control unit  50 . 
     In S 514 , by the reception notification of the HPD signal, the system control unit  50  detects that the external apparatus  300  is connected. The processing in S 514  corresponds to the processing in S 401 , S 417  and S 418  in  FIG. 4 . The system control unit  50  determines that the digital camera  100  is connected to the external apparatus  300  in a period when the HPD signal is being received, and determines that the digital camera  100  is not connected to the external apparatus  300  in the other periods. 
     In S 515 , the system control unit  50  controls the output I/F  91  and transmits an extended display identification data (EDIT) request signal via the connection cable  302 . The transmitted EDID request signal is transmitted to the external apparatus  300  via an EDID signal line (not illustrated) of the connection cable  302 . The external apparatus  300  receives the EDID request signal. 
     In S 516 , the external apparatus  300  transmits the EDID to the EDID signal line (not illustrated) of the connection cable  302 . The output I/F  91  of the digital camera  100  receives the transmitted EDID via the connection cable  302 . When the EDID is received, the output I/F  91  notifies the reception of the EDID to the system control unit  50 . 
     In S 517 , the system control unit  50  instructs the output I/F  91  to copy the EDID received in S 516  to the system memory  52 . After the copying completes, the system control unit  50  analyzes the EDID developed in the system memory  52 , and determines which image signal the external apparatus  300  is capable of receiving. The processing in S 517  corresponds to the processing in S 501  in  FIG. 5A . 
     In S 518 , the system control unit  50  determines whether the HDR output setting is enabled. If the external apparatus  300  can receive the HDR image signal and the HDR output setting is enabled, the system control unit  50  determines that the HDR image signal is outputted to the external apparatus  300 . If not, the system control unit  50  determines that the SDR image signal is outputted to the external apparatus  300 . The processing in S 518  corresponds to the processing in S 502  in  FIG. 5A . 
     In S 519 , the system control unit  50  instructs the output I/F  91  to start transmission of the image signal (HDR image signal or SDR image signal) determined in S 518 . The processing in S 519  corresponds to the processing in S 503  and S 504  in  FIG. 5A . 
     In S 520 , the output I/F  91  of the digital camera  100  outputs the image signal determined in S 518  to a transition minimized differential signaling (TMDS) signal line (not illustrated) of the connection cable  302 , and the external apparatus  300  receives this image signal via the TMDS signal line (not illustrated) of the connection cable  302 . 
     In S 521 , the external apparatus  300  analyzes the image signal received in S 518 , and if the driving setting of the external display unit  301  is a setting which does not allow display of this image signal, the external apparatus  300  switches the driving setting of the external display unit  301  to a setting which allows display of this image signal. 
     In S 522 , the external apparatus  300  displays the image signal received in S 518  on the external display unit  301 . 
       FIG. 5C  is a sequence diagram depicting a control procedure when the connection mode with the external apparatus  300  is switched from the SDR connection mode to the HDR connection mode. In this sequence, it is assumed that the connection between the digital camera  100  and the external apparatus  300  has completed in the sequence described in  FIG. 5B , and the SDR connection mode is set here. 
     In S 531 , the system control unit  50  instructs the output I/F  91  to transmit the SDR image signal. In S 532 , the output I/F  91  of the digital camera  100  outputs the SDR image signal to the TMDS signal line (not illustrated) of the connection cable  302 , and the external apparatus  300  receives the SDR image signal via the TMDS signal line (not illustrated) of the connection cable  302 . In S 533 , the external apparatus  300  displays the SDR image signal received in S 532  on the external display unit  301 . 
     While the SDR connection mode is being set, the SDR image is displayed on the external display unit  301  by repeating the processing in S 531  to S 533 . When the connection mode that is set is switched from the SDR connection mode to the HDR connection mode, the processing in S 534  and later is executed. 
     In S 534 , the system control unit  50  instructs the output I/F  91  to stop output of the SDR image signal. In S 535 , the output I/F  91  of the digital camera  100  stops output of the SDR image signal to the TMDS signal line (not illustrated) of the connection cable  302 . Thereby the external apparatus  300  stops reception of the SDR image signal via the TMDS signal line (not illustrated) of the connection cable  302 . In S 536 , the external apparatus  300  stops display of the image on the external display unit  301 , since reception of the image signal from the digital camera  100  stopped. 
     In S 537 , the system control unit  50  instructs the output I/F  91  to transmit the HDR image signal. In S 538 , the output I/F  91  of the digital camera  100  outputs the HDR image signal to the TMDS signal line (not illustrated) of the connection cable  302 , and the external apparatus  300  receives the HDR image signal via the TMDS signal line (not illustrated) of the connection cable  302 . 
     IN S 539 , the external apparatus  300  analyzes the image signal received in S 538 , and switches the driving setting of the external display unit  301  to a setting which allows display of the HDR image signal. In S 540 , the external apparatus  300  displays the HDR image signal received in S 538  on the external display unit  301 . Here the processing times in S 539  and S 540  are different depending on the performance of the external apparatus  300 , and it takes about 1 to 5 seconds until the image is displayed. 
       FIG. 5D  is a sequence diagram depicting a control procedure when the connection mode with the external apparatus  300  is switched from the HDR connection mode to the SDR connection mode. In this sequence, it is assumed that the connection between the digital camera  100  and the external apparatus  300  has completed in the sequence described in  FIG. 5B , and the HDR connection mode is set here. 
     In S 551 , the system control unit  50  instructs the output I/F  91  to transmit the HDR image signal. In S 552 , the output I/F  91  of the digital camera  100  outputs the HDR image signal to the TMDS signal line (not illustrated) of the connection cable  302 , and the external apparatus  300  receives the HDR image signal via the TMDS signal line (not illustrated) of the connection cable  302 . In S 553 , the external apparatus  300  displays the HDR image signal received in S 552  on the external display unit  301 . 
     While the HDR connection mode is set, the HDR image is displayed on the external display unit  301  by repeating the processing in S 551  to S 553 . When the currently set connection mode is switched from the HDR connection mode to the SDR connection mode, the processing in S 554  and later is executed. 
     In S 554 , the system control unit  50  instructs the output I/F  91  to stop output of the HDR image signal. In S 555 , the output I/F  91  of the digital camera  100  stops output of the HDR image signal to the TMDS signal line (not illustrated) of the connection cable  302 . Thereby the external apparatus  300  stops reception of the HDR image signal via the TMDS signal line (not illustrated) of the connection cable  302 . In S 556 , the external apparatus  300  stops display of the image on the external display unit  301 , since reception of the image signal from the digital camera  100  stopped. 
     In S 557 , the system control unit  50  instructs the output I/F  91  to transmit the SDR image signal. In S 558 , the output I/F  91  of the digital camera  100  outputs the SDR image signal to the TMDS signal line (not illustrated) of the connection cable  302 , and the external apparatus  300  receives the SDR image signal via the TMDS signal line (not illustrated) of the connection cable  302 . 
     In S 559 , the external apparatus  300  analyzes the image signal received in S 558 , and switches the driving setting of the external display unit  301  to a setting which allows display of the SDR image signal. In S 560 , the external apparatus  300  displays the SDR image signal received in S 558  on the external display unit  301 . Here the processing times in S 559  and S 560  are different depending on the performance of the external apparatus  300 , and it takes about 1 to 5 seconds until the image is displayed. 
     In the description in  FIGS. 5A to 5D , an HDMI connection is used for connection with the external apparatus  300 , but connection using Display Port or other digital connecting unit may be performed. 
     Reproduction Mode Processing (HDR Connection Mode) 
       FIG. 6  is a flow chart depicting details of the reproduction mode processing in the case when connection in the HDR connection mode has been performed (S 503  in  FIG. 5A ). This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In S 601 , the system control unit  50  acquires information on an image to be reproduced (e.g. metadata, file name) from the file of this image. 
     In S 602 , based on the information acquired in S 601  and the later mentioned S 637  (e.g. metadata and file name of image to be reproduced), the system control unit  50  determines whether the image to be reproduced is a RAW image that can be developed by the digital camera  100  (compatible RAW image). Processing advances to S 603  if it is determined that the image to be reproduced is a compatible RAW image, or to S 612  if not. The compatible RAW image is a RAW image captured by the digital camera  100 , for example. Based on the model information on the camera which captured this RAW image or the version information of the RAW image recorded in the attribute information of the RAW image file, it is determined that this RAW image is a compatible RAW image if this RAW image was captured by the same model as the digital camera  100 . RAW images captured by other models may be determined as incompatible RAW images. 
     In S 603 , the system control unit  50  reads a JPEG image for display, which is recorded in association with the compatible RAW image to be reproduced, from the recording medium  200  to the memory  32  using the recording medium I/F  18 , and is converted into an HDR image by pseudo-HDR conversion processing, and is then written to the memory  32 . In this embodiment, the pseudo-HDR conversion processing is processing to convert a JPEG image having an 8-bit gradation resolution (specific type image) into an HDR image having a 10-bit or 12-bit gradation resolution (pseudo-HDR image: converted image). For example, in BT.  2020 , a 10-bit gradation resolution is specified as the gradation resolution of an HDR image. In some cases, a 12-bit gradation resolution is specified as the gradation resolution of an HDR image. The pseudo-HDR conversion processing will be described in detail later with reference to  FIGS. 9A and 9B . 
     In S 604 , the system control unit  50  controls the output I/F  91 , and outputs (supplies) the pseudo-HDR image stored in the memory  32  to the external apparatus  300  in digital signal format. Thereby the pseudo-HDR image written in the memory  32  in S 603  is displayed on the external display unit  301  of the external apparatus  300  (HDR display). For example, a reproduction screen  1020  in  FIG. 10  is displayed on the external display unit  301 . The reproduction screen  1020  includes a pseudo-HDR image  1021 , an icon  1022  which indicates that the HDR display is being performed, and an icon  1002  which indicates that the RAW image is being displayed. It takes time to develop a compatible RAW image, hence in this embodiment, the JPEG image for display, which is associated with this compatible RAW image, is converted into the pseudo-HDR image before displaying the HDR image generated by developing the compatible RAW image, and this pseudo-HDR image is displayed. 
     In S 605 , the system control unit  50  determines whether the image switching operation was performed using the operation unit  70 . Processing advances to S 637  if it is determined that the image switching operation was performed, or to S 606  if not. 
     In S 606 , the system control unit  50  reads the compatible RAW image to be reproduced from the recording medium  200  to the memory  32  using the recording medium I/F  18 . 
     In S 607 , the system control unit  50  determines whether the image switching operation was performed using the operation unit  70 . Processing advances to S 637  if it is determined that the image switching operation was performed, or to S 608  if not. 
     In S 608 , the system control unit  50  starts the HDR generating processing (HDR developing processing) to generate an HDR image from the compatible RAW image which was read to the memory  32  in S 606 . In this embodiment, the HDR generating processing is developing processing (including color processing) to generate a developed HDR image from the RAW image using predetermined default parameters. The system control unit  50  writes the generated developed HDR image to the memory  32 . Unlike the developing processing to develop a RAW image and generate an 8-bit SDR image (e.g. processing to generate a JPEG image from RAW image), the HDR developing processing is processing to generate a 10-bit HDR image. 
     In S 609 , the system control unit  50  determines whether the image switching operation was performed using the operation unit  70 . Processing advances to S 637  if it is determined that the image switching operation was performed, or to S 610  if not. 
     In S 610 , the system control unit  50  determines whether the HDR developing processing started in S 608  completed. Processing advances to S 611  if it is determined that the developing processing completed, or to S 609  if not. 
     In S 611 , the system control unit  50  outputs the developed HDR image stored in the memory  32  to the external apparatus  300 . Thereby instead of the pseudo-HDR image displayed in S 604 , the developed HDR image generated in the HDR developing processing in S 608  is displayed on the external display unit  301  of the external apparatus  300  (HDR display). For example, the reproduction screen  1030  in  FIG. 10  is displayed on the external display unit  301 . The reproduction screen  1030  includes a developed HDR image  1031 , an icon  1002  which indicates that the RAW image is being displayed, and an icon  1022  which indicates that the HDR display is being performed. 
     When the pseudo-HDR image  1021  on the reproduction screen  1020  and the developed HDR image  1031  on the reproduction screen  1030  are compared in  FIG. 10 , the clouds in the sky, which is overexposed in the pseudo-HDR image  1021 , are not overexposed, and gradation is expressed in the developed HDR image  1031 . This is because the gradation resolution of the RAW image and the HDR image is higher than the gradation resolution of the SDR image, such as a JPEG image. In concrete terms, the gradation resolution of the JPEG image is low, hence overexposure is easily generated in the JPEG image. In the case of the pseudo-HDR image converted from a JPEG image as well, overexposure in the JPEG image remains, hence overexposure is easily generated. On the other hand, the gradation resolution of the RAW image and the HDR image is high, hence little overexposure is generated in the RAW image, and in the case of the developed HDR image generated by developing the RAW image as well, little overexposure is generated. 
     In S 612 , the system control unit  50  determines whether the image to be reproduced is a RAW image that is not supported in the developing processing of the digital camera  100  (incompatible RAW image), based on the information acquired in S 601  and the later mentioned S 637  (e.g. metadata and file name of image to be reproduced). Processing advances to S 613  if it is determined that the image to be reproduced is an incompatible RAW image, or to S 614  if not. 
     In S 613 , the system control unit  50  converts the JPEG image for display, which is recorded in association with the incompatible RAW image to be reproduced, into a pseudo-HDR image, similarly to S 603 . 
     In S 614 , the system control unit  50  determines whether the image to be reproduced is a JPEG image based on the information acquired in S 601  and the later mentioned S 637  (e.g. metadata and file name of image to be reproduced). Processing advances to S 615  if it is determined that the image to be reproduced is a JPEG image, or to S 617  if not. The JPEG image here is not a JPEG image for display which is included in the RAW file, but an image of an independent JPEG file. 
     In S 615 , the system control unit  50  reads the JPEG image to be reproduced from the recording medium  200  to the memory  32  using the recording medium I/F  18 , and is converted into a pseudo-HDR image in the pseudo-HDR converting processing, which will be described later with reference to  FIGS. 9A and 9B , and is then written to the memory  32 . 
     In S 616 , the system control unit  50  outputs the pseudo-HDR image generated in S 613  and S 615  to the external apparatus  300 , and displays the pseudo-HDR image (HDR display), similarly to S 604 . For example, if the image to be reproduced is an incompatible RAW image, a reproduction screen that is similar to the reproduction screen  1020  in  FIG. 10  is displayed on the external display unit  301 , and if the image to be reproduced is a JPEG image, the reproduction screen  1040  in  FIG. 10  is displayed on the external display unit  301 . Similarly to the reproduction screen  1020 , the reproduction screen  1040  includes the pseudo-HDR image  1021 , and the icon  1022  which indicates that the HDR display is being performed. The reproduction screen  1040 , however, includes an icon  1012  which indicates that the JPEG image is being displayed, instead of the icon  1002  which indicates that the RAW image is being displayed. Unlike the case of the compatible RAW image, the pseudo-HDR image is not replaced with the compatible HDR image after this step. 
     In S 617 , the system control unit  50  reads the image of the first frame of the moving image to be reproduced from the recording medium  200  to the memory  32  using the recording medium I/F  18 , and converts this image into a pseudo-HDR image in the pseudo-HDR converting processing, which will be described later, and then writes the pseudo-HDR image to the memory  32 . 
     In S 618 , the system control unit  50  outputs the pseudo-HDR image generated in S 617  to the external apparatus  300 , and displays the pseudo-HDR image (HDR display), similarly to S 604 . For example, a moving image reproduction preparation screen that is similar to the moving image reproduction preparation screen  1850  in  FIG. 18B  is displayed. 
     In S 619 , the system control unit  50  performs the operation receiving processing. The operation receiving processing in the case when the digital camera  100  is connected to the external apparatus  300  in the HDR connection mode will be described in detail later with reference to  FIG. 14B . In S 620 , the system control unit  50  performs moving image display processing. The moving image display processing, in the case when the digital camera  100  is connected to the external apparatus  300  in the HDR connection mode, will be described in detail later with reference to  FIG. 8B . 
     In S 621 , the system control unit  50  determines whether the menu button  70   e  was pressed. Processing advances to S 623  if it is determined that the menu button  70   e  was pressed, or to S 626  if not. In S 622  as well, the system control unit  50  determines whether the menu button  70   e  was pressed. Processing advances to S 623  if it is determined that the menu button  70   e  was pressed, or to S 627  if not. 
     In S 623 , the system control unit  50  sets the HDR connection mode flag to 1. When the HDR connection mode flag is set to 1, this means that the HDR connection mode was set immediately before the SDR connection mode is set, and that a temporary SDR connection is being performed. In S 624 , the system control unit  50  switches the currently set connection mode from the HDR connection mode to the SDR connection mode, and performs the external connection processing for connection in the SDR connection mode (SDR connection processing described in  FIG. 5D ). In S 625 , the system control unit  50  performs the menu processing. The menu processing, in the case when the digital camera  100  is connected to the external apparatus  300 , will be described in detail later with reference to  FIG. 7 . In this way, the connection mode is automatically switched to the SDR connection mode when the state of the connection in the HDR connection mode shifts the menu screen which does not include the reproduced image (captured image). 
     In S 626 , the system control unit  50  determines whether the shutter button  61  was half-depressed. Processing advances to S 628  if it is determined that the shutter button  61  was half-depressed, or to S 631  if not. In S 627  as well, the system control unit  50  determines whether the shutter button  61  was half-depressed. Processing advances to S 628  if it is determined that the shutter button  61  was half-depressed, or to S 632  if not. 
     In S 628 , the system control unit  50  sets the HDR connection mode flag to 1. In S 629 , the system control unit  50  switches the currently set connection mode from the HDR connection mode to the SDR connection mode, and performs the SDR connection processing (reconnection processing) described with reference to  FIG. 5D . In S 630 , the system control unit  50  performs the imaging mode processing. For example, in the imaging mode processing, the system control unit  50  outputs an imaging standby screen  1300  in  FIG. 13  to the external apparatus  300 , and displays this screen. In the state when the imaging standby screen is displayed (imaging standby state), the system control unit  50  performs imaging in accordance with the imaging instruction. When imaging is performed, the output screen to the external apparatus  300  is automatically switched to an imaging confirming screen  1310  in  FIG. 13 . Thereby the display screen of the external display unit  301  is automatically switched to the imaging confirming screen  1310 . In this way, when the state of connection in the HDR connection mode is switched to the imaging mode in the reproduction mode, the connection mode is automatically switched to the SDR connection mode. If the playback button  79  is pressed in the imaging mode and the mode is switched to the reproduction mode again when the HDR connection mode flag is 1, the SDR connection mode is switched back to the HDR mode, and the reproduced image is displayed. 
     In S 631 , the system control unit  50  determines whether the digital camera  100  is connected to the external apparatus  300 . Processing advances to S 402  in  FIG. 4  if it is determined that the digital camera  100  and the external apparatus  300  are not connected, or to S 633  if not. In S 632  as well, the system control unit  50  determines whether the digital camera  100  is connected to the external apparatus  300 . Processing advances to S 402  in  FIG. 4  if it is determined that the digital camera  100  and the external apparatus  300  are not connected, or to S 634  if not. 
     In S 633 , the system control unit  50  determines whether power off was instructed. The reproduction mode processing ends if it is determined that power off was instructed, or processing advances to S 635  if not. In S 634  as well, the system control unit  50  determines whether power off was instructed. The reproduction mode processing ends if it is determined that power off was instructed, or processing advances to S 636  if not. 
     In S 635 , the system control unit  50  determines whether the image switching operation was performed. Processing advances to S 637  if it is determined that the image switching operation was performed, or to S 619  if not. In S 636  as well, the system control unit  50  determines whether the image switching operation was performed. Processing advances to S 637  if it is determined that the image switching operation was performed, or to S 620  if not. 
     In S 637 , the system control unit  50  acquires information on the image to be reproduced next (e.g. metadata, file name) from the file of this image, similarly to S 601 . 
     The above is the reproduction mode processing in the case of connection in the HDR connection mode. In the reproduction mode processing in the case of connection in the SDR connection mode, on the other hand, processing similar to  FIG. 4  is performed. However, the processing corresponding to S 401  and S 403  is not performed, and processing is performed in which the “display unit  28 ” in the description in  FIG. 4  is regarded as the “external display unit  301 ”. Further, in the processing corresponding to S 417 , processing advances to S 402  if it is determined that the digital camera  100  is not connected to the external apparatus  300 , or to S 420  if not. In the same manner, in the processing corresponding to S 418 , processing advances to S 402  if it is determined that the digital camera  100  is not connected to the external apparatus  300 , or to S 421  if not. In other words, in the case of the connection in the SDR connection mode, the connection mode is not changed even if the screen shifts to the menu screen or if the mode is switched to the imaging mode. 
     Menu Processing 
       FIG. 7  is a flow chart depicting details of the menu processing (S 625  in  FIG. 6 ) in the case when the digital camera  100  is connected to the external apparatus  300 . This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In S 701 , the system control unit  50  outputs the menu screen to the external apparatus  300 , and displays the menu screen. In the case of a screen that is not a natural image, such as a menu screen, bright white is often used as a color for characters, icons, background and the like. For example, the menu screen  1100  in  FIG. 11  is displayed on the external display unit  301 . The menu screen  1100  includes a plurality of menu tabs  1101  and a plurality of menu items  1102 . The plurality of menu items  1102  includes the menu items  1103  to  1105 . The menu item  1103  is a menu item to switch enable/disable of the HDR output setting. The menu item  1104  is a menu item to switch enable/disable of the image protection (attribute to disable a delete of the image for protection). The menu item  1105  is a menu item to instruct execution of slide show processing by which a plurality of images are sequentially displayed. 
     In S 702 , the system control unit  50  determines whether the user selected the menu item  1103  to switch enable/disable of the HDR output setting. Processing advances to S 703  if it is determined that the menu item  1103  was selected, or to S 710  if not. If the menu item  1103  is selected, the system control unit  50  switches the output screen to the external apparatus  300  from the menu screen outputted in S 701  to a basic setting switching screen to switch enable/disable of the HDR output setting. For example, the output screen to the external apparatus  300  is switched from the menu screen  1100  in  FIG. 11  to the setting screen  1110  of the HDR output setting, and the display on the external display unit  301  is switched. The setting screen  1110  of the HDR output setting is a screen of which type is the same as the menu screen  1100 , but includes a selection item  1111  to disable the HDR output setting, and a selection item  1112  to enable the HDR output setting. 
     In S 703 , the system control unit  50  determines whether the user operation to switch the HDR output setting from disable (“NO”) to enable (“YES”) was performed. The user operation to switch the HDR output setting from disable to enable is selecting the selection item  1112  to enable the HDR output setting in the state where the HDR output setting is disabled. Processing advances to S 707  if it is determined that this user operation was performed, or to S 704  if not. 
     In S 704 , the system control unit  50  determines whether the user operation to switch the HDR output setting from enable (“YES”) to disable (“NO”) was performed. The user operation to switch the HDR output setting from enable to disable is selecting the selection item  1111  to disable the HDR output setting in the state where the HDR output setting is enabled. Processing advances to S 705  if it is determined that this user operation was performed, or to S 709  if not. 
     In S 705 , the system control unit  50  switches the HDR output setting from enable to disable, and records this setting value in the system memory  52 . In S 706 , the system control unit  50  sets the HDR connection mode flag to 0. 
     In S 707 , the system control unit  50  switches the HDR output setting from disable to enable, and records this setting value in the system memory  52 . In S 708 , the system control unit  50  sets the HDR connection mode flag to 1. 
     In S 709 , the system control unit  50  determines whether the user operation to return to the top menu screen from the setting screen of the HDR output setting, which was displayed when processing advances from S 702  to S 703 , was performed. Processing advances to S 701  if it is determined that this user operation was performed, or to S 703  if not. 
     In S 710 , the system control unit  50  determines whether the user selected the menu item  1104  to switch enable/disable of the image protection. Processing advances to S 711  if it is determined that this menu item  1104  was selected, or to S 713  if not. 
     In S 711 , the system control unit  50  switches the output screen to the external apparatus  300  from the menu screen outputted in S 701  to a protection setting switching screen to switch enable/disable of image protection. For example, the output screen to the external apparatus  300  is switched from the menu screen  1100  in  FIG. 11  to the protection setting switching screen  1120 , and the display on the external display unit  301  is switched. The protection setting switching screen  1120  includes: a target image  1121  of which enable/disable of image protection is switched; and an icon  1122  which indicates that this screen is the protection setting switching screen. The protection setting switching screen  1120  also includes an icon  1123  which indicates that the operating member to switch enable/disable of the protection is the SET button  75 . The protection setting switching screen  1120  includes an icon  1124  which indicates that the operating member to exit from the protection setting switching screen  1120  is the menu button  70   e . Each time the SET button  75  is pressed, the system control unit  50  switches enable/disable of the image protection. If the image protection is enabled, the system control unit  50  changes the output screen, so that an icon  1125  which indicates that image protection is enabled is also displayed. 
     The image  1121  of the protection setting switching screen  1120  is an image reproduced immediately before the menu processing, an image selected from a plurality of images recorded on the recording medium  200  by another user operation or the like. The image  1121  is displayed without switching the currently set connection mode from the SDR connection mode to the HDR connection mode, even if this is an image of the image file of a compatible RAW image. In other words, if the compatible RAW image is the target of setting the protection, JPEG for display, included in the RAW image file, is outputted in the SDR connection mode. In the menu processing, an image similar to the image  1121  may be displayed, for example, when the image selection is deleted, another attribute such as rating (degree of significance) to the image is added, an attribute of the image is changed, or image editing such as trimming is performed. In such a case as well, the image is displayed without switching the currently set connection mode to the HDR connection mode. 
     In S 712 , the system control unit  50  determines whether the user operation to return to the menu screen from the protection setting switching screen displayed in S 711  (pressing the menu button  70   e ) was performed. Processing advances to S 701  if it is determined that this user operation was performed, or to S 711  if not. 
     In S 713 , the system control unit  50  determines whether the user selected the menu item  1105  to instruct execution of the slide show processing. Processing advances to S 714  if it is determined that this menu item  1105  was selected, or to S 715  if not. 
     In S 714 , the system control unit  50  performs the slide show processing. The slide show processing will be described in detail later with reference to  FIGS. 16A, 16B and 17 . 
     In S 715 , the system control unit  50  determines whether the user selected a menu item other than the menu items  1103  to  1105 . Processing advances to S 716  if it is determined that this menu item was selected, or to S 717  if not. 
     In S 716 , the system control unit  50  performs the processing in accordance with the menu item selected in S 715 . For example, the image selection is detected, an attribute is added to the image, an attribute of the image is changed, the image is edited, the captured image confirming time is changed, enable/disable of the electronic sound output is switched, or an external stroboscope is controlled. 
     In S 717 , the system control unit  50  determines whether the user performed the menu processing end operation. Processing advances to S 718  if it is determined that the menu processing end operation was performed, or to S 701  if not. 
     In S 718 , the system control unit  50  determines whether the HDR connection mode flag is 1. Processing advances to S 719  if it is determined that the HDR connection mode flag is 1, or to S 721  if not. 
     In S 719 , similarly to S 501  described above, the system control unit  50  determines whether the external apparatus  300  supports HDR. Processing advances to S 720  if it is determined that the external apparatus  300  supports HDR, or to S 721  if not. 
     In S 720 , the system control unit  50  switches the currently set connection mode from the SDR connection mode to the HDR connection mode, and performs the external connection processing for the connection in the HDR connection mode (HDR connection processing described above in  FIG. 5C ; reconnection processing). 
     In S 721 , the system control unit  50  performs the reproduction mode processing that is performed in the case of the connection in the SDR connection mode (modification of  FIG. 4 ). 
     In S 722 , the system control unit  50  performs the reproduction mode processing that is performed in the case of the connection in the HDR connection mode ( FIG. 6 ). 
     The above is the menu processing in the case when the digital camera  100  is connected to the external apparatus  300 . Processing similar to  FIG. 7  is performed even in the case when the digital camera  100  is not connected to the external apparatus  300 . However, the processing corresponding to S 718  to S 722  is not performed, and processing is performed in which the “external display unit  301 ” in the description in  FIG. 7  is regarded as the “display unit  28 ”. If it is determined that the menu processing end operation was performed in the processing corresponding to S 717 , the system control unit  50  performs the reproduction mode processing in  FIG. 4 . 
     Moving Image Display Processing 
       FIG. 8A  is a flow chart depicting details of the moving image display processing (S 410  in  FIG. 4 ) in the case when the digital camera  100  is not connected to the external apparatus  300 . This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. When this processing is started, the moving image reproduction preparation screen  1850  in  FIG. 18B  is displayed on the display unit  28  (S 408  in  FIG. 4 ). 
     In S 801 , the system control unit  50  determines whether the user instructed to reproduce the moving image. Processing advances to S 807  if the user instructed to reproduce the moving image, or to S 802  if not. 
     In S 802 , the system control unit  50  determines whether the user instructed to display the operation panel for the moving image reproduction. Processing advances to S 803  if the user instructed to display the operation panel, or the moving image display processing is ended if not. 
     In S 803 , the system control unit  50  displays the operation panel on the display unit  28 . For example, the screen  1200  in  FIG. 12  is displayed. The screen  1200  includes a frame  1201  of the reproduction target moving image, an operation panel  1202  for various user operations to reproduce moving images, and an icon  1203  which indicates a user operation to end the moving image display processing and return to the reproduction mode processing. When reproduction of the moving image is not started, the first frame of the moving image is displayed as a frame  1201 , and during reproduction of the moving images, the frame displayed as the frame  1201  sequentially changes over time. The operation panel  1202  includes a reproduction button  1204  to instruct the start of reproduction of the moving image. The operation panel  1202  also includes a button to instruct frame forward, a button to instruct frame return, and a button to instruct slow reproduction. Further, the operation panel  1202  includes a button to shift to the editing mode, an indicator bar to express the time position of the currently displayed frame, and a button to instruct to adjust the sound volume. The icon  1203  indicates a user operation, to be performed to end the moving image display processing and return to the reproduction mode processing, activated by pressing the menu button  70   e.    
     In S 804 , the system control unit  50  determines whether the user instructed to reproduce the moving image (e.g. selecting the reproduction button  1204 ). Processing advances to S 807  if the user instructed to reproduce the moving image, or to S 805  if not. 
     In S 805 , the system control unit  50  determines whether the user instructed to end the moving image display processing (e.g. pressing the menu button  70   e ). The moving image display processing ends if the user instructed to end the moving image display processing, or processing advances to S 806  if not. 
     In S 806 , if another user operation is performed, the system control unit  50  performs processing in accordance with this user operation. For example, adjustment of the sound volume, frame forward, frame return, slow reproduction, and moving image editing during reproducing the moving image, may be performed. 
     In S 807 , the system control unit  50  performs the moving image reproduction processing. Thereby the progressing images of the moving image are displayed on the display unit  28 . 
     In S 808 , the system control unit  50  determines whether the user instructed to stop the moving image reproduction. Processing returns to S 803  if the user instructed to stop the moving image reproduction, or to S 807  if not. When processing returns from S 808  to S 803 , the system control unit  50  performs the processing to stop the moving image reproduction. Thereby the frame  1201  on the screen  1200  no longer changes. 
     Even in the moving image display processing when the connection is in the SDR connection mode, processing similar to  FIG. 8A  is performed. However, “display unit  28 ” in the description in  FIG. 8A  is regarded as “external display unit  301 ”. 
       FIG. 8B  is a flow chart depicting details of the moving image display processing (S 620  in  FIG. 6 ) in the case when the connection is in the HDR connection mode. This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. Before this processing is started, a moving image reproduction preparation screen similar to the moving image reproduction preparation screen  1850  in  FIG. 18B  is displayed on the external display unit  301  (S 618  in  FIG. 6 ). 
     In S 811 , the system control unit  50  determines whether the user instructed to reproduce the moving image. Processing advances to S 821  if the user instructed to reproduce the moving image, or to S 812  if not. 
     In S 821 , the system control unit  50  switches the currently set connection mode from the HDR connection mode to the SDR connection mode, and performs the external connection processing for the connection in the SDR connection mode (SDR connection processing described above in  FIG. 5D ; reconnection processing). Then processing advances to S 817 , and the moving image reproduction processing is performed. Thereby progressing images of the moving image are outputted to the external apparatus  300 , and displayed on the external display unit  301 . 
     In S 812 , the system control unit  50  determines whether the user instructed to display the operation panel for the moving image reproduction. Processing advances to S 822  if the user instructed to display the operation panel, or the moving image display processing is ended if not. 
     In S 822 , the system control unit  50  switches the currently set connection mode from the HDR connection mode to the SDR connection mode, and performs the external connection processing for the connection in the SDR connection mode (SDR connection processing described above in  FIG. 5D ; reconnection processing). Then processing returns to S 813 , where the operation panel is outputted to the external apparatus  300 , and displayed on the external display unit  301 . 
     The processing in S 814  to S 818  is similar to S 804  to S 808  described above, hence description thereof will be omitted. The output destination of the images here, however, is not the display unit  28  but the external apparatus  300 . 
     Processing advances to S 823  if it is determined that the end of the moving image display processing was instructed in S 815  in the state where the operation panel for moving image reproduction is being outputted. 
     In S 823 , the system control unit  50  switches the currently set connection mode from the SDR connection mode to the HDR connection mode, and performs the external connection processing for the connection in the HDR connection mode (HDR connection processing described above in  FIG. 5C ; reconnection processing). 
     As described above, in the case of outputting images in the HDR connection mode, if a moving image is selected by the image switching operation, the image converted into a pseudo-HDR image in S 618  is outputted as the representative image of the moving image which is displayed first after the image switching operation, without changing the HDR connection mode. Then in the case of switching to the next image without reproducing the moving image, the next image can be displayed without generating processing to switch the connection mode. Since the connection mode is not switched in the state of image forwarding (or image returning) where the user is continuously performing the image switching operation, the user can continuously switch images at a comfortable speed. On the other hand, if the user instructed to reproduce the moving image or to display the operation panel in the state where the representative image of the moving image, converted into the pseudo-HDR image, is being displayed, this may be a case in which the user is viewing the displayed moving image with interest. In this case, the connection mode is switched from the HDR connection mode to the SDR connection mode (reconnected), then the moving image is displayed. Thus the moving image recorded at SDR image quality can be displayed without conversion (pseudo-HDR conversion), although it takes time for the reconnection processing, hence the moving image can be viewed with accurate tinge precisely as recorded. When the viewing of the moving image ends, the connection mode is automatically returned to the original HDR connection mode in S 823 . 
     Pseudo-HDR Converting Processing 
       FIG. 9A  is a flow chart depicting details of the pseudo-HDR converting processing (S 603 , S 613 , S 615  and S 617  in  FIG. 6 ). This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. In the pseudo-HDR converting processing, the gradation resolution of the image is enhanced, and the gradation characteristic of the image (correspondence between the gradation value and brightness) is converted. In this embodiment, an example of converting an SDR image (e.g. JPEG image) with YCC  422  (BT.  601 , BT.  601 ) into a pseudo-HDR image YCC  422  (ST.  2084 , BT.  2020 ) by the pseudo-HDR converting processing will be described. Here YCC (BT.  601 , BT.  601 ) refers to the color space (gradation characteristic, gradation resolution)=YCC  422  (gradation characteristic specified in BT.  601 , and gradation resolution specified in BT.  601 ). In the same manner, YCC  422  (ST.  2084 , BT.  2020 ) refers to YCC  422  (gradation characteristic specified in ST.  2084 , gradation resolution specified in BT.  2020 ). The same method of interpretation is applied to the other description herein below. 
     In S 901 , the system control unit  50  converts the color space of the SDR image with YCC  422  (BT.  601 , BT.  601 ) written in the memory  32  into RGB. Thereby the SDR image with YCC  422  (BT.  601 , BT.  601 ) is converted into an image with RGB (BT.  601 , BT.  601 ). 
     In S 902 , the system control unit  50  converts the gradation character of the image with RGB (BT.  601 , BT.  601 ) acquired in S 901  into a linear characteristic, in which brightness increases linearly with respect to the increase in the gradation value (y conversion using a predetermined y curve). Thereby the image with RGB (BT.  601 , BT.  601 ) is converted into an image with RGB (linear characteristic, BT.  601 ). 
     In S 903 , the system control unit  50  converts the gradation resolution of the image with RGB (linear characteristic, BT.  601 ) acquired in S 902  into the gradation resolution specified in BT.  2020  (CG conversion). Thereby the image with RGB (linear characteristic, BT.  601 ) is converted into an image with RGB (linear characteristic, BT.  2020 ). If the gradation resolution of the image is increased from the gradation resolution specified in BT.  601  to the gradation resolution specified in BT.  2020 , the color gamut (range of colors that can be expressed) expands. 
     In S 904 , the system control unit  50  converts the gradation characteristic of the image with RGB (linear characteristic, BT.  2020 ) acquired in S 903  into the gradation characteristic specified in ST.  2084  (γ conversion using the γ curve in  FIG. 9B ). Thereby the image with RGB (linear characteristic, BT.  2020 ) is converted into an image with RGB (ST.  2084 , BT.  2020 ). The gradation characteristic specified in ST.  2084  is called “perceptual quantization” (PQ). 
     In S 905 , the system control unit  50  converts the color space of the image with RGB (ST.  2084 , BT.  2020 ) acquired in S 904  into YCC  422 . Thereby the image with RGB (ST.  2084 , BT.  2020 ) is converted into a pseudo-HDR image with YCC  422  (ST.  2084 , BT.  2020 ). 
     Summary of  FIGS. 4 to 9A and 9B   
     According to this embodiment, in the case when the connection is not in the HDR connection mode, the image after the developing processing (which takes much time to display) is not displayed, but a JPEG image (which takes less time to display) is displayed (S 406 , S 407  and S 408  in  FIG. 4 ). Even if connection is in the HDR connection mode, a pseudo-HDR image (which takes less time to display) is displayed (S 604 , S 616  and S 618  in  FIG. 6 ). In the case of displaying a developed HDR image (which takes much time to display), the pseudo-HDR image is displayed, and then the developed HDR image is displayed instead of the pseudo-HDR image (S 604  and S 611  in  FIG. 6 ). If an instruction to switch to the next image is received before completing processing such as the developing processing or RAW image reading processing, the current processing is interrupted, and processing to display the next image is performed (YES in S 605 , S 607 , and S 609  in  FIG. 6 ). Further, the switching of the connection mode causes a delay in the start of display, but the JPEG image is converted into the pseudo-HDR image and displayed while connection in the HDR connection mode is continued (maintained) (S 616  and S 618  in  FIG. 6 ). Thereby various images are appropriately displayed. For example, various images can be displayed quickly or displayed with switching the connection mode. As a result, the user can view images appropriately (in comfort). 
     Further, if an instruction to switch the reproduction screen  1030  of the HDR display to the menu screen  1100 , in which bright white is often used, is received, for example, as indicated in  FIG. 13 , the connection mode is switched to the SDR connection mode (S 624  in  FIG. 6 ). Thereby the glare that is generated on screen, in which bright white is often used, is suppressed, and each screen can be displayed in an appropriate connection mode. 
     Switching of the connection mode causes a delay in the start of display. Therefore in the case of the protection setting switching screen  1120 , which is one of the screens selected in the menu items, this screen is displayed without being switched to the HDR connection mode, even if a captured image that can be displayed with HDR image quality (image of the compatible RAW image file) is included in the screen. Thereby in the operation flow, the generation of wait time, due to the switching of the connection mode, can be suppressed. 
     If HDR display is performed during image capturing, the display image and the captured image may become different. Therefore, as indicated in  FIG. 13 , the connection mode is switched to the SDR connection mode if an instruction to switch from the reproduction screen  1030  of the HDR display to the imaging standby screen  1300  is received (S 629  in  FIG. 6 ). Thereby the display image can be matched with the captured image, which improves user friendliness. Since display of the imaging confirming screen  1310  is also an SDR display, the generation of wait time due to the switching of the connection mode can be suppressed, and the user can comfortably check the imaging result and perform the next imaging. 
     Each time the reproduction screen  1030  of the HDR display is switched with the screen  1100 ,  1120 ,  1300  or  1310 , the connection mode is switched. When the currently set connection mode is switched, the screen including an item (e.g. message) to notify that the currently set connection mode will be switched, may be displayed. 
     An example of outputting or displaying a captured image was described, but a computer graphic may be outputted or displayed instead. A connection mode that is different from the SDR connection mode and the HDR connection mode may be set. An image that is outputted in the SDR connection mode may not be a JPEG image, and the gradation resolution may not be an 8-bit gradation resolution. For example, an image having an 8-bit or less gradation resolution may be outputted in the SDR connection mode. The gradation resolution of an image that is outputted in the HDR connection mode may not be 10-bit or 12-bit. The HDR generating processing may include processing other than the developing processing, or may not include the developing processing. The type of image on which the HDR generating processing is performed may not be RAW. The pseudo-HDR conversion processing is not especially limited, as long as an image having a desired gradation resolution and desired gradation characteristic can be acquired. For example, the pseudo-HDR converting processing may not include the conversion of color space. A pseudo-HDR image having a gradation characteristic referred to as a hybrid log gamma (HLG) may be acquired. Various screens as well may not be those described above. 
     Operation Receiving Processing 
       FIG. 14A  is a flow chart depicting details of the operation receiving processing (S 409  in  FIG. 4 ) in the case when the digital camera  100  is not connected to the external apparatus  300 . This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In S 1401 , the system control unit  50  determines whether the information button  70   g  was pressed. Processing advances to S 1402  if it is determined that the information button  70   g  was pressed, or processing ends if not. In S 1402 , the system control unit  50  determines whether the imaging information (imaging setting information) is displayed on the display unit  28 . Processing advances to S 1403  if it is determined that the image information is displayed, or to S 1404  if not. In S 1403 , the system control unit  50  determines whether the brightness histogram (histogram to indicate brightness distribution of an image) is displayed on the display unit  28 . Processing advances to S 1406  if it is determined that the brightness histogram is displayed, or to S 1405  is not. In S 1404 , the system control unit  50  displays the imaging information on the display unit  28 . In S 1405 , the system control unit  50  displays the brightness histogram on the display unit  28 . In S 1406 , the system control unit  50  controls such that the imaging information and the brightness histogram are not displayed. 
       FIG. 15A  indicates the transition of the display on the display unit  28  caused by pressing the information button  70   g . If the information button  70   g  is pressed in a state where a screen  1500  that includes only an image (target image)  1501  is displayed on the display unit  28 , the display on the display unit  28  shifts from the screen  1500  to a screen  1510  by the processing in S 1404  in  FIG. 14A . In the screen  1510 , imaging information  1511  and imaging information  1512  of the image  1501  are superimposed at the top and bottom of the image  1501  respectively. If the information button  70   g  is pressed in a state where the screen  1510  is displayed on the display unit  28 , the display on the display unit  28  shifts from the screen  1510  to a screen  1520  by the processing in S 1405  in  FIG. 14A . The screen  1520  includes an image  1521  generated by reducing the image  1501 , and a brightness histogram  1522  of the image  1501  and imaging information  1523  of the image  1501 . If the information button  70   g  is pressed in a state where the screen  1520  is displayed on the display unit  28 , the display on the display unit  28  shifts from the screen  1520  to the screen  1500  by the processing in S 1406  in  FIG. 14A . 
     Between the imaging information  1512  of the screen  1510  and the imaging information  1523  of the screen  1520 , it is assumed that the type and size of the information display items (items of information display) to be displayed are different. For example, the imaging information  1523  includes information  1524  on the exposure correction, information  1525  on the white balance setting, setting information  1526  to correct the white balance setting, and information  1527  on the picture style setting to set sharpness and contrast of the image. This information is not included in the imaging information  1512 . The setting content of other setting items, histograms to indicate the distribution of RGB values of images, setting information of the color space of images and the like may be included in the screen. 
     Processing similar to  FIG. 14A  is performed as well in the operation receiving processing in the case of connection in the SDR connection mode. Here, however, the “display unit  28 ” in the description of  FIG. 14A  is regarded as the “external display unit  301 ”. 
       FIG. 14B  is a flow chart depicting details of the operation receiving processing (S 619  in  FIG. 6 ) in the case when the connection is in the HDR connection mode. This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In S 1411 , the system control unit  50  determines whether the information button  70   g  was pressed. Processing advances to S 1412  if it is determined that the information button  70   g  was pressed, or processing ends if not. In S 1412 , the system control unit  50  determines whether the imaging information is outputted to the external apparatus  300 . Processing advances to S 1414  if it is determined that the imaging information is outputted, or to S 1413  if not. In S 1413 , the system control unit  50  outputs the imaging information to the external apparatus  300 , and displays the imaging information. In S 1414 , the system control unit  50  controls such that the imaging information is not outputted. 
       FIG. 15B  indicates the transition of the display on the display unit  301  caused by pressing the information button  70   g . If the information button  70   g  is pressed in a state when a screen  1530  which includes only an image  1531  is displayed on the external display unit  301 , the display on the external display unit  301  shifts from the screen  1530  to a screen  1540  by the processing in S 1413  in  FIG. 14B . In the screen  1540 , imaging information  1541  and imaging information  1542  of the image  1531  are superimposed at the top and bottom of the image  1531  respectively. Further, an icon  1543  which indicates that the HDR display (connection in the HDR connection mode) is being performed, is also displayed. If the information button  70   g  is pressed in a state where the screen  1540  is displayed on the external display unit  301 , the display on the external display unit  301  shifts from the screen  1540  to the screen  1530  by the processing in S 1414  in  FIG. 14B . 
     In this way, in the case of the connection in the HDR connection mode, the system control unit  50  controls the screen transition so that the screen does not shift to a predetermined screen, as indicated in the screen  1520 , in which the brightness histogram is displayed and the image is reduced, so that an area other than the image occupies a large part of the screen. Thereby the brightness histogram is no longer displayed when the connection is the HDR connection mode. As mentioned above, on the display unit  28 , which is the main monitor of the digital camera  100 , a JPEG for display, included in the RAW image file, is displayed with SDR image quality, even if this image is a compatible RAW image. The histogram displayed at this time is calculated based on image having SDR image quality displayed on the display unit  28 . On the other hand, if a histogram that is the same as the case of the main unit monitor is displayed when this compatible RAW image is developed to have HDR image quality and displayed with HDR image quality, the image viewed by the user on the external display unit  301  and the histogram do not accurately match. This is because the histogram on the main monitor is not the histogram calculated based on the displayed image having HDR image quality. For example, it is assumed that on the main monitor, the white portions are saturated and histogram has many maximum brightness values. Even in this case, when HDR image is displayed on the external display unit  301 , there may be less white portions that are saturated and the image may be displayed with better gradations than the main monitor. In this case, the histogram having many maximum brightness values does not exactly match the appearance of the image on the external display unit  301 , which causes discomfort to the user. On the other hand, if the histogram is calculated and displayed based on the HDR image generated by developing this compatible RAW image to have HDR image quality, then the histogram on the main unit monitor and the one on the external display unit  301  become different, even if these are histograms of the same image. This as well causes discomfort to the user. Therefore, in this embodiment, the histogram is not displayed when the image is being outputted in the HDR connection mode, so that the user does not refer to the histogram information while viewing the image with HDR image quality. As a consequence, the discomfort of the user, determination errors by the user on exposure and the like, and imaging setting errors by the user, for example, can be suppressed, and image capturing that is not intended by the user can be prevented. 
     Further, shift of the screen to a screen having a large non-image area (area that may be displayed in a single color, such as white), in which the image is reduced, is also suppressed, therefore glare on screen displayed as a single color, such as white, can be prevented. 
     In the case of the connection in the HDR connection mode, the screen may shift to a screen to display the detailed image information, such as screen  1520 . However, it is preferable that information that causes the image to appear different between the SDR display and the HDR display (information display item related to at least one of brightness, gradation and tinge) is not displayed. For example, it is preferable not to display information on exposure correction, information on white balance setting, setting information to correct white balance setting, and information on picture style setting to set the sharpness and contrast of an image. It is also preferable not to display a histogram indicating the distribution of RGB values of an image and setting information on the color space of an image. 
     When the screen  1540  is shifted to the screen  1530 , the system control unit  50  may temporarily output a screen  1550  which includes a guidance  1551  to notify that the shift to the screen to display the brightness histogram is disabled, and displays this screen  1550  on the external apparatus  300  ( FIG. 15C ). Further, after outputting the screen  1550  on the guidance  1551 , the system control unit  50  may output a screen that includes a guidance to prompt the determination whether the HDR connection mode is cancelled and the SDR connection mode is set, and display this screen on the external apparatus  300 . If an instruction to cancel the HDR connection mode is received, the system control unit  50  switches the currently set connection mode from the HDR connection mode to the SDR connection mode, and performs the SDR connection processing. When the SDR connection mode is set, the screen can be shifted to such as screen as the screen  1520 . If processing to emphasize an image region having a brightness information that exceeds a predetermined threshold by a flashing display or the like (highlight warning display) can be performed, this highlight warning processing may be disabled when the image  1531  is displayed. 
     Slide Show Processing 
       FIG. 16A  is a flow chart depicting details of the slide show processing (S 714  in  FIG. 7 ). This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In S 1601 , the system control unit  50  determines whether the HDR connection mode flag is set to 1. Processing advances to S 1602  if the HDR connection mode flag is set to 1, or to S 1603  if not. In S 1602 , the system control unit  50  determines whether the external apparatus  300  supports HDR, similarly to S 501 . Processing advances to S 1604  if HDR is supported, or to S 1603  if not. In S 1603 , the system control unit  50  executes the slide show processing in  FIG. 16B . In S 1604 , the system control unit  50  executes the slide show processing in  FIG. 17 . 
       FIG. 16B  is a flow chart depicting details of the slide show processing performed in S 1603  in  FIG. 16A . This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. Various screens in the slide show processing in  FIG. 16B  are displayed on the display unit  28  if the digital camera  100  is not connected to the external apparatus  300 , or on the external display unit  301  if the digital camera  100  is connected to the external apparatus  300  in the SDR connection mode. 
     In S 1611 , the system control unit  50  displays a slide show start preparation screen  1800  indicated in  FIG. 18A . 
     In S 1612 , the system control unit  50  acquires information on the image, that is displayed first in the slide show processing (e.g. metadata, file name), from the file of this image. 
     In S 1613 , the system control unit  50  stops display of the slide show start preparation screen. 
     In S 1614 , the system control unit  50  displays a display target image. The processing in S 1614  is the same as the processing in S 404  to S 407  in  FIG. 4  if the display target is the images of a still image file. If the display target is a moving image, processing the same as S 807  in  FIG. 8  is performed. Although description was omitted in  FIG. 4 , when an image is displayed, the system control unit  50  reads the image to be displayed (image data) from the recording medium  200 , and develops the image in the memory  32 . Then using the image processing unit  24 , the system control unit  50  decodes and resizes the format size of the developed image to a format size that can be displayed on the display unit  28  and the external display unit  301 . The processed image is stored in the memory  32 . 
     In S 1615 , the system control unit  50  determines whether a predetermined time (switching interval), that is set in advance as a display time for each image in the slide show, has elapsed since the image was displayed in S 1614 . Processing advances to S 1616  if it is determined that the predetermined time has elapsed, or to S 1617  if not. If the display target is a moving image, it is determined in the processing in S 1615  whether the moving image was reproduced until the end or whether the image switching operation was performed, instead of determining whether the predetermined time has elapsed. Processing advances to S 1616  if either the moving image was reproduced until the end or the image switching operation was performed, or to S 1617  if not. 
     In S 1616 , the system control unit  50  acquires information of the image that is displayed next (e.g. metadata, file name) from the file of this image. 
     In S 1617 , the system control unit  50  determines whether the slide show processing is ended. The system control unit  50  determines to end the slide show processing if the user instructed to end the slide show, or if display of all the images to be reproduced in the slide show processing completed, or determines not to end the slide show processing if not. The slide show processing ends if it is determined that the slide show processing is ended, or processing advances to S 1615  if not. 
       FIG. 17  is a flow chart depicting details of the slide show processing that is performed in S 1604  in  FIG. 16A . This processing is implemented when the program recorded in the non-volatile memory  56  is developed in the system memory  52 , and the system control unit  50  executes the program. 
     In S 1701 , the system control unit  50  sets the SDR connection mode flag to 1. The SDR connection mode flag indicates whether the setting of the SDR connection mode is temporary. 
     In S 1702 , the system control unit  50  outputs the slide show start preparation screen to the external apparatus  300  via the output I/F  91 . Thereby the slide show start preparation screen  1800  is displayed on the external display unit  301  as indicated in  FIG. 18A . 
     In S 1704 , the system control unit  50  acquires information on an image that is displayed first in the slide show processing (e.g. metadata, file name) from the file of this image. 
     In S 1705 , the system control unit  50  determines whether the image to be outputted is a moving image based on the information acquired in S 1704  and the later mentioned S 1728  (e.g. metadata and file name of image to be outputted). Processing advances to S 1706  if the image to be outputted is a moving image, or to S 1715  if not. 
     In S 1706 , the system control unit  50  determines whether the SDR connection mode flag is set to 0. Processing advances to S 1707  if the SDR connection mode flag is set to 0, or to S 1711  if not. 
     In S 1707 , the system control unit  50  switches the currently set connection mode from the HDR connection mode to the SDR connection mode, that is, performs the SDR connection processing described in  FIG. 5D . In S 1708 , the system control unit  50  sets the SDR connection mode flag to 1. 
     In S 1709 , the system control unit  50  reads the moving image to be outputted from the recording medium  200 , and outputs the first frame (stopped image) of this moving image to the external apparatus  300 , and displays this image. 
     In S 1710 , the system control unit  50  determines whether a predetermined time (time longer than the time estimated required for the SDR connection processing; at least 5 seconds) has elapsed since output of the first frame. The predetermined time here is unrelated to the above mentioned switching interval (time that is set in advance as a display time for each image in the slide show), and is set independently from the above mentioned switching time. Further, the predetermined time here is longer than at least the time for one frame of the frame rate ( 1/30 seconds if the frame rate is 30 fps) in the case of outputting the progressing images of a moving image. The predetermined time here is at least 0.3 seconds. Processing advances to S 1711  if it is determined that the predetermined time has elapsed, or to S 1710  if not. In the case when a plurality of moving images are outputted continuously, the determination result in S 1706  becomes NO for the second and later moving images, hence the processing in S 1709  (output of stopped image) and S 1710  (standby for a predetermined time) is omitted. 
     In S 1711 , the system control unit  50  performs the moving image reproduction processing from the first frame. Thereby the progressing images of the moving image are outputted to the external apparatus  300 , and are displayed. 
     In S 1712 , the system control unit  50  determines whether the user performed the image switching operation. Processing advances to S 1713  if it is determined that the image switching operation was performed, or to S 1714  if not. 
     In S 1713 , the system control unit  50  performs the processing to stop the moving image reproduction. 
     In S 1714 , the system control unit  50  determines whether the moving image was reproduced until the end (until the last frame). Processing advances to S 1728  if it is determined that the moving image was reproduced until the end, or to S 1712  if not. 
     If the image to be outputted is a still image, on the other hand, the system control unit  50  determines in S 1715  whether the SDR connection mode flag is set to 1. Processing advances to S 1716  if the SDR connection mode flag is set to 1, or to S 1718  if not. 
     In S 1716 , the system control unit  50  performs the HDR connection processing described in  FIG. 5C , to switch the currently set connection mode from the SDR connection mode to the HDR connection mode. In S 1717 , the system control unit  50  sets the SDR connection mode flag to 0. 
     In S 1718 , the system control unit  50  determines whether the image to be outputted is a compatible RAW image based on the information acquired in S 1704  and the later mentioned S 1728  (e.g. metadata and file name of image to be outputted). Processing advances to S 1719  if it is determined that the image to be outputted is a compatible RAW image, or to S 1722  if not. 
     In S 1719 , the system control unit  50  reads the compatible RAW image to be outputted from the recording medium  200 , and develops this image in the system memory  32 . In S 1720 , the system control unit  50  performs the HDR developing processing to generate a developed HDR image from the compatible RAW image developed in the system memory  32  in S 1719 . In S 1721 , the system control unit  50  outputs the developed HDR image generated in S 1720  to the external apparatus  300 , and displays the image. 
     In S 1722 , the system control unit  50  determines whether the image to be outputted is an incompatible RAW image based on the information acquired in S 1704  and the later mentioned S 1728  (e.g. metadata and file name of image to be outputted). Processing advances to S 1723  if it is determined that the image to be outputted is an incompatible RAW image, or to S 1724  if not. 
     In S 1723 , the system control unit  50  converts a JPEG image for display, which was recorded in association with the incompatible RAW image to be outputted, into a pseudo-HDR image. In S 1724 , the system control unit  50  converts the JPEG image to be outputted into a pseudo-HDR image (processing described above in  FIG. 9A ). The JPEG image in S 1724  is not a JPEG image for display included in the RAW file, but an image in an independent JPEG file. In S 1725 , the system control unit  50  outputs the pseudo-HDR image generated in S 1723  or S 1724  to the external apparatus  300 , and displays the pseudo-HDR image. 
     In S 1726 , the system control unit  50  determines whether a predetermined time (switching interval which is set in advance as a display time for each image in the slide show) has elapsed since the output of the image in S 1721  or S 1725 . Processing advances to S 1728  if it is determined that the predetermined time has elapsed, or to S 1727  if not. It is irrelevant whether the predetermined time in S 1726  and the predetermined time in S 1710  are the same or different. 
     In S 1727 , the system control unit  50  determines whether the user performed the image switching operation. Processing advances to S 1728  if it is determined that the image switching operation was performed, or to S 1729  if not. 
     In S 1728 , the system control unit  50  acquires information on the image to be outputted next (e.g. metadata, file name) from the file of this image. 
     In S 1729 , the system control unit  50  determines whether the slide show processing is ended. The slide show processing ends if it is determined that the slide show processing is ended, or processing advances to S 1726  if not. 
       FIG. 18A  indicates a transition example of the screens in the slide show processing in  FIG. 17 . 
     First the slide show start preparation screen  1800  is displayed on the external display unit  301  by the processing in S 1702  in  FIG. 17 . While the slide show start preparation screen  1800  is displayed, the information acquisition in S 1704  is performed. 
     If the first output image is any one of a compatible RAW image, an incompatible RAW image, and a JPEG image, the connection is switched to the HDR connection mode. Then by the processing in S 1721  or S 1725 , the screen  1810  of one of these images is displayed on the external display unit  301  in the HDR connection mode (HDR display). In this case, the SDR connection mode flag is 0. In this state, the image is switched to the next image by the image switching operation or when a predetermined time elapses, and if the next image is a moving image, the SDR connection processing is performed in S 1707 . 
     While performing the SDR connection processing in S 1707 , the output of the image is stopped so that display during switching of the connection mode is not seen, and the display screen of the external display unit  301  shifts from the screen  1810  to the screen  1820 . 
     Here it is assumed that the moving image reproducing processing (output of progressing images) in S 1711  is performed immediately. In this case, the progressing images may be outputted from the digital camera  100  before the external display unit  301  completes preparation for display. If the progressing images are outputted before the preparation completes, the initial portion of the moving image is not displayed on the external display unit  301 , and the moving image is displayed on the external display unit  301  from the middle of the moving image as indicated in the screen  1830 , hence the user cannot see the initial portion. 
     Therefore in this embodiment, the digital camera  100  outputs the first frame (stopped image) of the moving image after the SDR connection processing, and starts the moving image reproducing processing after a predetermined time elapses. Thereby the user can view the moving image from the beginning as indicated in the screen  1840 . The screen  1840  is a screen of the stopped image. The screen  1840  includes an item  1841  that indicates that the moving image reproducing processing is automatically performed after a predetermined time elapses. 
     If an item to instruct the start of reproduction of the moving image (item  1852  in  FIG. 18B ) is included in the screen of the stopped image, the user may misunderstand that the progressing images will not be displayed unless some operation is performed. Therefore it is preferable not to include such an item in the stopped image. 
     However, in some cases, preparation for the external display unit  301  to perform display may complete before the moving image reproducing processing is automatically performed. Therefore it is preferable that the system control unit  50  starts output of the progressing images in accordance with a predetermined user operation (e.g. moving image reproducing instruction) that is received in a predetermined period after the output of the stopped image. Thereby the user can view the progressing images without waiting until the predetermined time elapses after the output of the stopped image, which improves user friendliness. 
     Summary of  FIGS. 16A, 16B and 17   
     According to this embodiment, in the case when the currently set connection mode is switched from the HDR connection mode to the SDR connection mode to reproduce the moving image, the stopped image of the moving image is outputted during this switching. Then the progressing images of the moving image are automatically outputted when a predetermined time elapses after the start of the output of the stopped image. Thereby when the currently set connection mode is switched from the HDR connection mode to the SDR connection mode to reproduce the moving image, it can be avoided that the output of the progressing images is started before the external display unit  301  completes preparation for the display and the initial portion of the moving image is not displayed. As a result, the user can view the moving image from the initial portion. This method of reproducing a moving image can also be applied to the moving image display processing in  FIG. 8B . In other words, after S 821  in  FIG. 8B , the processing in S 1709  and S 1710  in  FIG. 17  may be performed before performing the processing in S 817 . 
     The above mentioned processing may be performed not only for switching the SDR connection mode and the HDR connection mode, but also for switching the connection mode required for other reasons. For example, if it is necessary to change the connection to a connection mode of which image size (resolution) is different, or a connection mode of which frame rate is different when a reproduction of a moving image is started, the processing in S 1709  and  1710  in  FIG. 17  may be performed before outputting the progressing images of the moving image. For example, if reproduction of a moving image having a 4K image quality (4K resolution, that is, a resolution of about 4000 horizontal×2000 vertical) is instructed, in a state where the connection mode is for outputting an image having a 2K full HD image quality, processing to change the connection to the connection mode for 4K image quality is expected to be performed. In this case, if the processing in S 1709  and S 1710  in  FIG. 17  is performed before starting the output of the progressing images of the moving image, then it can be prevented that the user will not see the initial portion of the moving image having 4K image quality. In the same manner, if reproduction of a moving image recorded at a 60 p frame rate is instructed when the connection mode is for outputting an image having a 24 p frame rate, processing to change the connection to the connection mode for 60 p is expected to be performed. In this case, if the processing in S 1709  and S 1710  in  FIG. 17  is performed before starting the output of the progressing images of the moving image, it can be prevented that the user will not see the initial portion of the moving image at 60 p. 
     The various controls described above that are assumed to be performed by the system control unit  50  may be performed by one hardware unit, or may be distributed to a plurality of hardware (e.g. a plurality of processors and circuits) playing respective roles to control the entire apparatus. 
     The present invention has been described using preferred embodiments, but the present invention is not limited to these specific embodiments, but various modes within the scope that does not depart from the essence of the invention are also included in the present invention. Further, each embodiment described above is merely an example, and each embodiment may be combined as required. 
     In the embodiments described above, the present invention is applied to the digital camera (imaging apparatus), but the present invention is not limited to this example, but may be applied to any electronic apparatus that can output an image to an external apparatus. For example, the present invention can be applied to a personal computer, a PDA, a portable telephone terminal, a portable image viewer, a printer, a digital photo frame, a music player, a game machine, an electronic book reader, an image player, a display apparatus (including a projection apparatus), a tablet terminal, a smartphone, a home electronic appliance, and an onboard vehicle unit. 
     The present invention can be applied not only to an imaging apparatus main unit, but also to a control apparatus which communicates with an imaging apparatus (including a network camera) via a cable or wireless communication, and remotely controls the imaging apparatus. Examples of an apparatus that remotely controls the imaging apparatus include: a smartphone, a tablet PC and a desktop PC. The imaging apparatus can be remotely controlled by the control apparatus notifying commands to perform various operations and settings to the imaging apparatus based on the operations and processing performed at the control apparatus side. The live-view images captured by the imaging apparatus may be received and displayed on the control apparatus side via a cable or wireless communication. 
     OTHER EMBODIMENTS 
     Embodiment(s) of the present invention can also be realized by a computer of a system or apparatus that reads out and executes computer executable instructions (e.g., one or more programs) recorded on a storage medium (which may also be referred to more fully as a ‘non-transitory computer-readable storage medium’) to perform the functions of one or more of the above-described embodiment(s) and/or that includes one or more circuits (e.g., application specific integrated circuit (ASIC)) for performing the functions of one or more of the above-described embodiment(s), and by a method performed by the computer of the system or apparatus by, for example, reading out and executing the computer executable instructions from the storage medium to perform the functions of one or more of the above-described embodiment(s) and/or controlling the one or more circuits to perform the functions of one or more of the above-described embodiment(s). The computer may comprise one or more processors (e.g., central processing unit (CPU), micro processing unit (MPU)) and may include a network of separate computers or separate processors to read out and execute the computer executable instructions. The computer executable instructions may be provided to the computer, for example, from a network or the storage medium. The storage medium may include, for example, one or more of a hard disk, a random-access memory (RAM), a read only memory (ROM), a storage of distributed computing systems, an optical disk (such as a compact disc (CD), digital versatile disc (DVD), or Blu-ray Disc (BD)™), a flash memory device, a memory card, and the like. 
     While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions. 
     According to the above embodiments, the following configurations are disclosed. 
     (1) An electronic apparatus, comprising: 
     a connecting unit (connector) configured to connect with an external apparatus; 
     a setting unit configured to set a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than a first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted; and 
     a control unit configured to control so that in a case where the connection is in the second connection mode and an instruction to switch a first screen including a captured image captured by an imaging unit (image sensor) to a second screen not including a captured image is received, the set connection mode is switched from the second connection mode to the first connection mode, and the second screen is outputted from the connecting unit. 
     (2) The electronic apparatus according to (1), 
     wherein in a case where an instruction to switch the second screen, which was outputted by switching the set connection mode from the second connection mode to the first connection mode, to the first screen is received, the control unit controls so that the set connection mode is switched from the first connection mode to the second connection mode and the first screen is outputted from the connecting unit. 
     (3) The electronic apparatus according to (1) or (2), 
     wherein the second screen is a menu screen including a plurality of menu items, and 
     in a case where an instruction to select a specific menu item on the second screen, which was outputted by switching the set connection mode from the second connection mode to the first connection mode is received, the control unit controls so that a screen, which relates to the specific menu item and includes the captured image, is outputted from the connecting unit without changing the set connection mode from the first connection mode. 
     (4) The electronic apparatus according to any one of (1) to (3), 
     further comprising a converting unit configured to convert a specific type of image having the first gradation resolution into a converted image generated by converting a gradation resolution to a second gradation resolution which is higher than the first gradation resolution and converting a gradation characteristic, 
     wherein in a case where the connection is in the second connection mode, the control unit controls so that the specific type of image is converted by the converting unit and outputted when the first screen including the specific type of image is outputted from the connecting unit. 
     (5) The electronic apparatus according to (4), 
     wherein the specific type of image is a JPEG image. 
     (6) The electronic apparatus according to (4) or (5), 
     wherein the second gradation resolution is 10-bit or 12-bit gradation resolution. 
     (7) The electronic apparatus according to any one of (1) to (6), 
     wherein the first gradation resolution is 8-bit gradation resolution. 
     (8) The electronic apparatus according to any one of (1) to (7), 
     wherein in a case where the set connection mode is switched from the second connection mode to the first connection mode, the control unit controls so that a screen including an item to notify that the set connection mode is switched is outputted from the connecting unit. 
     (9) An electronic apparatus, comprising: 
     a connecting unit configured to connect with an external apparatus; 
     a setting unit configured to set a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than a predetermined gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the predetermined gradation resolution is outputted; and 
     a control unit configured to control so that in a case where the connection is in the second connection mode and an instruction to switch a first screen including a reproduced image to a third screen to perform imaging is received, the set connection mode is switched from the second connection mode to the first connection mode and the third screen is outputted from the connecting unit. 
     (10) The electronic apparatus according to (9), 
     wherein the third screen is a screen including a live-view image captured by an imaging unit. 
     (11) The electronic apparatus according to (9) or (10), 
     wherein the third screen is a screen on which imaging setting information on imaging by the imaging unit is displayed. 
     (12) The electronic apparatus according to any one of (9) to (11), 
     wherein the control unit controls so that the imaging is performed in a case where an imaging instruction is received in a state where the set connection mode is switched from the second connection mode to the first connection mode and the third screen is being outputted from the connecting unit, and the first connection mode is continued in a case where the screen is automatically switched to a fourth screen which is a screen to confirm a captured image acquired by this imaging and includes a reproduced image. 
     (13) The electronic apparatus according to (12), 
     wherein the fourth screen is a screen to confirm the captured image acquired by a previous imaging. 
     (14) The electronic apparatus according to (13), 
     wherein the fourth screen is a quick review screen. 
     (15) The electronic apparatus according to any one of (9) to (14), 
     wherein in a case where a user operation to switch the screen to the first screen is received in a state where the set connection mode is switched from the second connection mode to the first connection mode, the control unit controls so that the set connection mode is returned to the second connection mode when the screen is switched to the first screen. 
     (16) The electronic apparatus according to any one of (9) to (15), 
     wherein the first screen is a reproduction screen in a reproduction mode, and 
     the third screen is an imaging standby screen in a imaging mode. 
     (17) A control method for an electronic apparatus, comprising: 
     a connecting step of connecting with an external apparatus; 
     a setting step of setting a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than a first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted; and 
     a control step of controlling so that in a case where the connection is in the second connection mode and an instruction to switch a first screen including a captured image captured by an imaging unit to a second screen not including a captured image is received, the set connection mode is switched from the second connection mode to the first connection mode, and the second screen is outputted to the external apparatus. 
     (18) A control method for an electronic apparatus, comprising: 
     a connecting step of connecting with an external apparatus; 
     a setting step of setting a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than a predetermined gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the predetermined gradation resolution is outputted; and 
     a control step of controlling so that in a case where the connection is in the second connection mode and an instruction to switch a first screen including a reproduced image to a third screen to perform imaging is received, the set connection mode is switched from the second connection mode to the first connection mode and the third screen is outputted to the external apparatus. 
     (19) A program that causes a computer to function as each unit of the electronic apparatus according to any one of (1) to (16). 
     (20) A computer readable medium storing a program that causes a computer to function as each unit of the electronic apparatus according to any one of (1) to (16). 
     (21) An electronic apparatus, comprising: 
     a converting unit configured to convert a first type of image having a first gradation resolution to a converted image generated by converting a gradation resolution into a second gradation resolution which is higher than the first gradation resolution and converting a gradation characteristic; 
     a generating unit configured to generate an image having the second gradation resolution, from a second type of image having a gradation resolution which is higher than the first gradation resolution; 
     a connecting unit configured to connect with an external apparatus; and 
     a control unit configured to control so that, in a case where an image based on the second type of image is outputted, a converted image having the second gradation resolution and generated by converting, by the converting unit, an accompanying image, which is an image having the first gradation resolution recorded in association with the second type of image, is outputted from the connecting unit, and then, instead of the converted image, an image having the second gradation resolution and generated from the second type of image by the generating unit, is outputted from the connecting unit. 
     (22) The electronic apparatus according to (21), 
     further comprising an instructing unit configured to perform a switching instruction of an image to be outputted from the connecting unit, 
     wherein in a case where the switching instruction is received after the converted image generated by converting the accompanying image is outputted and before the generating unit completes processing of the second type of image, the control unit controls so that the processing of the second type of image by the generating unit is interrupted, and processing to output a switched image in accordance with the switching instruction from the connecting unit is performed. 
     (23) The electronic apparatus according to (21) or (22), 
     wherein in a case where a switching instruction of an image to be outputted from the connecting unit is received after the converted image generated by converting the accompanying image is outputted and before reading of the second type of image for processing of the generating unit completes, the control unit controls so that the reading of the second type of image is interrupted, and processing to output a switched image in accordance with the switching instruction from the connecting unit is performed. 
     (24) The electronic apparatus according to any one of (21) to (23), wherein regarding the second type of image, in a case where processing to output an image having the second gradation resolution and generated by the generating unit from the connecting unit, instead of the converted image, is not performed, the control unit controls so that the second type of image is not read.
 
(25) The electronic apparatus according to any one of (21) to (24),
 
     further comprising a setting unit configured to set a connection mode with the external apparatus to any of a plurality of connection modes including a first connection mode in which an image having a gradation resolution which is not higher than the first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted, 
     wherein the control unit controls so that 
     in a case where the connection is in the first connection mode, the accompanying image recorded in association with the second type of image is outputted from the connecting unit without being converted by the converting unit, and 
     in a case where the connection is in the second connection mode, the converted image, generated by converting the accompanying image recorded in association with the second type of image using the converting unit, is outputted from the connecting unit, and then an image having the second gradation resolution and generated from the second type of image by the generating unit is outputted from the connecting unit instead of the converted image. 
     (26) The electronic apparatus according to (25), 
     wherein in a case where the external apparatus does not support the second connection mode, regarding the second type of image, the control unit controls so that the converted image of the accompanying image is outputted from the connecting unit, and processing to output the image having the second gradation resolution and generated by the generating unit from the connecting unit instead of the converted image is not performed. 
     (27) The electronic apparatus according to any one of (21) to (26), 
     wherein the second type of image is a captured image which was captured by an imaging unit. 
     (28) The electronic apparatus according to any one of (21) to (27), 
     wherein processing of the generating unit includes developing processing. 
     (29) The electronic apparatus according to any one of (21) to (28), 
     wherein the first type of image is a JPEG image. 
     (30) The electronic apparatus according to any one of (21) to (29), 
     wherein the second type of image is a RAW image. 
     (31) The electronic apparatus according to any one of (21) to (30), 
     wherein the first gradation resolution is 8-bit gradation resolution. 
     (32) The electronic apparatus according to any one of (21) to (31), 
     wherein the second gradation resolution is 10-bit or 12-bit resolution gradation. 
     (33) A control method for an electronic apparatus, comprising: 
     a converting step of converting a first type of image having a first gradation resolution to a converted image generated by converting a gradation resolution into a second gradation resolution which is higher than the first gradation resolution and converting a gradation characteristic; 
     a generating step of generating an image having the second gradation resolution, from a second type of image having a gradation resolution which is higher than the first gradation resolution; 
     a connecting step of connecting with an external apparatus; 
     a first control step of controlling so that a converted image having the second gradation resolution and generated by converting, in the converting step, an accompanying image, which is an image having the first gradation resolution recorded in association with the second type of image, is outputted to the external apparatus; and 
     a second control step of controlling so that, after outputting in the first control step, instead of the converted image, an image having the second gradation resolution and generated from the second type of image in the generating step, is outputted to the external apparatus. 
     (34) A program that causes a computer to function as each unit of the electronic apparatus according to any one of (21) to (32). 
     (35) A computer readable medium storing a program that causes a computer to function as each unit of the electronic apparatus according to any one of (21) to (32). 
     (36) An electronic apparatus, comprising: 
     
         
         
           
             a connecting unit configured to connect with an external apparatus; 
             a display unit (display); and 
             a control unit configured to control so that 
             when a target image is displayed on the display unit, the target image is displayed with a first gradation resolution, and an information display item on at least one of brightness, gradation and tinge of the target image is also displayed, and 
             when the target image is outputted from the connecting unit, the target image is outputted at a second gradation resolution, which is higher than the first gradation resolution, without outputting the information display item of the target image.
 
(37) The electronic apparatus according to (36),
 
           
         
       
    
     further comprising a converting unit configured to convert a specific type of image having the first gradation resolution into a converted image generated by converting a gradation resolution into a second gradation resolution which is higher than the first gradation resolution, and converting a gradation characteristic, 
     wherein in a case where the target image is the specific type of image, the control unit controls so that the target image is converted by the converting unit and outputted when the target image is outputted from the connecting unit. 
     (38) The electronic apparatus according to (37), 
     wherein the specific type of image is a JPEG image. 
     (39) The electronic apparatus according to any one of (36) to (38), 
     wherein the control unit controls so that when the target image is displayed on the display unit with the first gradation resolution, the screen shifts to the predetermined screen, and when the target image is outputted from the connecting unit with the second gradation resolution, the screen does not shift to the predetermined screen. 
     (40) The electronic apparatus according to (39), 
     wherein in a case where the screen is controlled not to shift to the predetermined screen, the control unit controls so that a screen including an item which notifies that the shift to the predetermined screen is disabled is outputted from the connecting unit. 
     (41) The electronic apparatus according to any one of (36) to (40), 
     further comprising a switching unit configured to switch the screen to any of a plurality of screens, in which volumes of information of the target image are mutually different, each time a user operation is performed using a specific operating member, 
     wherein the predetermined screen is a screen included in the plurality of screens. 
     (42) The electronic apparatus according to any one of (36) to (41), 
     wherein the first gradation resolution is 8-bit gradation resolution. 
     (43) The electronic apparatus according to any one of (36) to (42), 
     wherein the second gradation resolution is 10-bit or 12-bit gradation resolution. 
     (44) The electronic apparatus according to any one of (36) to (43), 
     further comprising a setting unit configured to set the connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than the first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted, 
     wherein the control unit controls so that 
     in a case where the connection is in the second connection mode, the target image is outputted with the first gradation resolution and a brightness histogram of the target image is outputted on the predetermined screen, when the target image is outputted from the connecting unit, and 
     in a case where the connection is in the first connection mode, the target image is outputted with the second gradation resolution without outputting the brightness histogram of the target image, when the target image is outputted from the connecting unit. 
     (45) The electronic apparatus according to any one of (36) to (44), 
     wherein the information display item is a brightness histogram. 
     (46) The electronic apparatus according to any one of (36) to (44), 
     wherein the information display item indicates at least one of exposure correction, white balance setting, setting to correct the white balance setting, setting content of setting items to set sharpness and contrast of an image, a histogram to indicate a distribution of RGB values of the image and setting of a color space of the image. 
     (47) An electronic apparatus, comprising: 
     a connecting unit configured to connect with an external apparatus; 
     a setting unit configured to set the connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than the first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted; and 
     a control unit configured to control so that 
     in a case where the connection is in the second connection mode, a target image is outputted with the first gradation resolution, and a brightness histogram of the target image is outputted on a predetermined screen, when the target image is outputted from the connecting unit, and 
     in a case where the connection is in the first connection mode, the target image is outputted with a second gradation resolution which is higher than the first gradation resolution without outputting the brightness histogram of the target image, when the target image is outputted from the connecting unit. 
     (48) A control method for an electronic apparatus including a display unit, comprising: 
     a connecting step of connecting with an external apparatus; and 
     a control step of controlling so that 
     when a target image is displayed on the display unit, the target image is displayed with a first gradation resolution, and an information display item on at least one of brightness, gradation and tinge of the target image is also displayed, and 
     when the target image is outputted to the external apparatus, the target image is outputted at a second gradation resolution, which is higher than the first gradation resolution, without outputting the information display item of the target image. 
     (49) A control method for an electronic apparatus, comprising: 
     a connecting step of connecting with an external apparatus; 
     a setting step of setting the connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than the first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted; and 
     a control step of controlling so that 
     in a case where the connection is in the second connection mode, a target image is outputted with the first gradation resolution, and a brightness histogram of the target image is outputted on a predetermined screen, when the target image is outputted to the external apparatus, and 
     in a case where the connection is in the first connection mode, the target image is outputted with a second gradation resolution which is higher than the first gradation resolution without outputting the brightness histogram of the target image, when the target image is outputted to the external apparatus. 
     (50) A program that causes a computer to function as each unit of the electronic apparatus according to any one of (36) to (47). 
     (51) A computer readable medium storing a program that causes a computer to function as each unit of the electronic apparatus according to any one of (36) to (47). 
     (52) An electronic apparatus, comprising: 
     a connecting unit configured to connect with an external apparatus; 
     a setting unit configured to set a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode and a second connection mode; and 
     a control unit configured to control so that 
     in a case where the connection in the second connection mode and an instruction to reproduce a specific type of moving image is received, the set connection mode is switched from the second connection mode to the first connection mode, a stopped image of the moving image is outputted from the connecting unit, and progressing images of the moving image are automatically outputted from the connecting unit after a predetermined time elapses from the output of the stopped image. 
     (53) The electronic apparatus according to (52), 
     wherein the first connection mode is a connection mode in which an image having a first gradation resolution is outputted, and 
     the second connection mode is a connection mode in which an image having a second gradation resolution which is higher than the first gradation resolution is outputted. 
     (54) The electronic apparatus according to (53), 
     wherein the first gradation resolution is 8-bit gradation resolution. 
     (55) The electronic apparatus according to (53) or (54), 
     wherein the second gradation resolution is 10-bit or 12-bit gradation resolution. 
     (56) The electronic apparatus according to any one of (52) to (55), 
     wherein the specific type of moving image is a moving image having a first gradation resolution. 
     (57) The electronic apparatus according to (52), 
     wherein the first connection mode is a connection mode in which an image having a first resolution is outputted, 
     the second connection mode is a connection mode in which an image having a second resolution which is different from the first resolution is outputted, and 
     the specific type of moving image is a moving image having the first resolution. 
     (58) The electronic apparatus according to (52), 
     wherein the first connection mode is a connection mode in which an image having a first frame rate is outputted, 
     the second connection mode is a connection mode in which an image having a second frame rate which is different from the first frame rate is outputted, and 
     the specific type of moving image is a moving image having the first frame rate. 
     (59) The electronic apparatus according to any one of (52) to (58), 
     wherein the stopped image includes an item to notify that the progressing images are automatically outputted after the predetermined time elapses. 
     (60) The electronic apparatus according to any one of (52) to (59), 
     wherein the control unit controls so that in a case where a predetermined user operation is performed before the predetermined time elapses, the progressing images are outputted from the connecting unit even if the predetermined time has not yet elapsed. 
     (61) The electronic apparatus according to any one of (52) to (60), 
     wherein the stopped image does not include a display item to instruct the start of reproduction. 
     (62) The electronic apparatus according to any one of (52) to (61), 
     wherein the predetermined time is at least 0.3 seconds. 
     (63) The electronic apparatus according to any one of (52) to (62), 
     further comprising a processing unit configured to perform a slide show in which a plurality of images are automatically switched one by one at a predetermined switching interval, and each image is outputted to the external apparatus, 
     wherein the predetermined time is a time that is independently set regardless the switching interval. 
     (64) A control method for an electronic apparatus, comprising: 
     a connecting step of connecting with an external apparatus; 
     a setting step of setting a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode and a second connection mode; and 
     a control step of controlling so that 
     in a case where the connection in the second connection mode and an instruction to reproduce a specific type of moving image is received, the set connection mode is switched from the second connection mode to the first connection mode, a stopped image of the moving image is outputted to the external apparatus, and progressing images of the moving image are automatically outputted to the external apparatus after a predetermined time elapses from the output of the stopped image. 
     (65) A program that causes a computer to function as each unit of the electronic apparatus according to any one of (52) to (63). 
     (66) A computer readable medium storing a program that causes a computer to function as each unit of the electronic apparatus according to any one of (52) to (63). 
     (67) An electronic apparatus, comprising: 
     a converting unit configured to convert a first type of image having a first gradation resolution into a converted image generated by converting a gradation resolution to a second gradation resolution which is higher than the first gradation resolution, and converting a gradation characteristic; 
     a connecting unit configured to connect with an external apparatus; 
     a setting unit configured to set a connection mode with the external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than the first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted; and 
     a control unit configured to control so that 
     in a case where the connection is in the first connection mode, the first type of image is outputted from the connecting unit without converting the first type of image by the converting unit, and 
     in a case where the connection is in the second connection mode, the first type of image is converted by the converting unit, and is outputted from the connecting unit. 
     (68) The electronic apparatus according to (67), wherein regarding a second type of image having a gradation resolution which is higher than the first gradation resolution, the control unit controls so that in a case where the connection is in the second connection mode, an image based on the second type of image is outputted from the connecting unit, without converting the second type of image by the converting unit.
 
(69) The electronic apparatus according to (67) or (68),
 
     wherein regarding a second type of image having a gradation resolution which is higher than the first gradation resolution, the control unit controls so that 
     in a case where the connection is in the first connection mode, an image having the first gradation resolution which is recorded in association with the second type of image is outputted from the connecting unit, and 
     in a case where the connection is in the second mode, an image having the second gradation resolution is generated from the second type of image, and is outputted from the connecting unit. 
     (70) The electronic apparatus according to (68) or (69), wherein source of the image to be outputted from the connecting unit can be switched from the second type of image to the first type of image, while maintaining the connection in the second connection mode.
 
(71) The electronic apparatus according to any one of (68) to (70), wherein the second type of image is an image before developing processing is performed.
 
(72) The electronic apparatus according to any one of (67) to (71), wherein the first type of image is a JPEG image.
 
(73) The electronic apparatus according to any one of (67) to (72), wherein the reconnection processing with the external apparatus is performed in a case where the set connection mode is switched from the second connection mode to the first connection mode.
 
(74) The electronic apparatus according to (73), wherein the reconnection processing is processing for an HDMI (registered trademark) connection.
 
(75) The electronic apparatus according to any one of (67) to (74), wherein processing by the converting unit includes processing to convert a color space of an image.
 
(76) The electronic apparatus according to (75),
 
     wherein the converting unit sequentially performs: 
     processing to convert the color space of the image into a first color space; 
     processing to convert a gradation characteristic of the image into a first gradation characteristic; 
     processing to convert a gradation resolution of the image from the first gradation resolution into the second gradation resolution; 
     processing to convert the gradation characteristic of the image into a second gradation characteristic; and 
     processing to convert the color space of the image into a second space. 
     (77) The electronic apparatus according to any one of (67) to (76), wherein the converting unit converts an image with color space (gradation characteristic, gradation resolution)=YCC (gradation characteristic specified in BT.  601 , gradation resolution specified in BT.  601 ) into an image with YCC (gradation characteristic specified in ST.  2084 , gradation resolution specified in BT.  2020 ).
 
(78) The electronic apparatus according to (77), wherein the converting unit sequentially performs:
 
     processing to convert an image with color space (gradation characteristic, gradation resolution)=YCC (gradation characteristic specified in BT.  601 , gradation resolution specified in BT.  601 ) into an image with RGB (gradation characteristic specified in BT.  601 , gradation resolution specified in BT.  601 ); 
     processing to convert an image with RGB (gradation characteristic specified in BT.  601 , gradation resolution specified in BT.  601 ) into an image with RGB (linear characteristic, gradation resolution specified in BT.  601 ); 
     processing to convert an image with RGB (linear characteristic, gradation resolution specified in BT.  601 ) into an image with RGB (linear characteristic, gradation characteristic specified in BT.  2020 ); 
     processing to convert an image with RGB (linear characteristic, gradation resolution specified in BT.  2020 ) into an image with RGB (gradation characteristic specified in ST.  2084 , gradation resolution specified in BT.  2020 ); and 
     processing to convert an image with RGB (gradation characteristic specified in ST.  2084 , gradation resolution specified in BT.  2020 ) into an image with YCC (gradation characteristic specified in ST.  2084 , gradation resolution specified in BT.  2020 ). 
     (79) The electronic apparatus according to any one of (67) to (78), wherein the first gradation resolution is 8-bit gradation resolution. 
     (80) The electronic apparatus according to any one of (67) to (79), wherein the second gradation resolution is 10-bit or 12-bit gradation resolution. 
     (81) A control method for an electronic apparatus, comprising: 
     a converting step of converting a first type of image having a first gradation resolution into a converted image generated by converting a gradation resolution to a second gradation resolution which is higher than the first gradation resolution, and converting a gradation characteristic; 
     a setting step of setting a connection mode with an external apparatus to any of a plurality of connection modes, including a first connection mode in which an image having a gradation resolution which is not higher than the first gradation resolution is outputted, and a second connection mode in which an image having a gradation resolution which is higher than the first gradation resolution is outputted; and 
     a control step of controlling so that 
     in a case where the connection is in the first connection mode, the first type of image is outputted to the external apparatus without converting the first type of image in the converting step, and 
     in a case where the connection is in the second connection mode, the first type of image is converted in the converting step, and is outputted to the external apparatus. 
     (82) A program that causes a computer to function as each unit of the electronic apparatus according to any one of (67) to (80). 
     (83) A computer readable medium storing a program that causes a computer to function as each unit of the electronic apparatus according to any one of (67) to (80). 
     In each embodiment described above, the processing in the case where the output I/F  91  is connected to the external apparatus  300  in the HDR connection mode, and the processing in the case where the output I/F  91  is connected to the external apparatus  300  in the SDR connection mode were described. But, the present invention is not limit to this, and the present invention can be applied to processing in a case where an image is output to various display devices that can receive images from the digital camera  100 . For example, the present invention can be applied to processing in a case where an image is outputted to the external ENT (Electronic ViewFinder) unit which is regarded as the external apparatus  300 . Furthermore, devices to which images are output are not limited to external apparatuses, and the present invention can be applied to image output processing to a back monitor (the display unit  28 ) of the digital camera  100  (various electronic apparatuses not limited to the imaging apparatus) or a built-in EVF in a case where the display unit  28  or the built-in EVF supports HDR image signals (the display unit  28  or the built-in EVF is capable of performing the HDR display). As an example, it is assumed that the display unit  28  is capable of performing the HDR display, and an HDR display mode or an SDR display mode can be selected and set as a display mode for the display unit  28 . In this case, as processing in the HDR display mode, it is possible to perform the same processing as the HDR connection mode in each embodiment described above. As processing in the SDR display mode, it is possible to perform the same processing as the SDR connection mode in each embodiment described above. According to these processing, for example, the following electronic apparatuses are disclosed. 
     An electronic apparatus, comprising: 
     a converting unit configured to convert a first type of image having a first gradation resolution into a converted image generated by converting a gradation resolution to a second gradation resolution which is higher than the first gradation resolution, and converting a gradation characteristic; 
     an output unit configured to output an image signal to a display unit; 
     a setting unit configured to set a display mode for the display unit to any of a plurality of display modes, including a first display mode in which an image having a gradation resolution which is not higher than the first gradation resolution is displayed, and a second display mode in which an image having a gradation resolution which is higher than the first gradation resolution is displayed; and 
     a control unit configured to control so that 
     in a case where the displaying is in the first display mode, the first type of image is outputted to the display unit without converting the first type of image by the converting unit, and 
     in a case where the displaying is in the second display mode, the first type of image is converted by the converting unit, and is outputted to the display unit. 
     And, source of the image to be outputted from the output unit can be switched from a second type of image (for example, a RAW image) to the first type of image (for example, a JPEG image), while maintaining the setting of the second display mode (an HDR display mode). 
     Furthermore, the following electronic apparatuses are disclosed. 
     An electronic apparatus, comprising: 
     a converting unit configured to convert a first type of image having a first gradation resolution to a converted image generated by converting a gradation resolution into a second gradation resolution which is higher than the first gradation resolution and converting a gradation characteristic; 
     a generating unit configured to generate an image having the second gradation resolution, from a second type of image having a gradation resolution which is higher than the first gradation resolution; 
     an output unit configured to output an image signal to a display unit; 
     a control unit configured to control so that, in a case where the second type of image is outputted, a converted image having the second gradation resolution and generated by converting, by the converting unit, an accompanying image, which is an image having the first gradation resolution recorded in association with the second type of image, is outputted from the output unit, and then, instead of the converted image, an image having the second gradation resolution and generated from the second type of image by the generating unit, is outputted from the output unit. 
     An electronic apparatus, comprising: 
     an output unit configured to output an image signal to a display unit; 
     a setting unit configured to set a display mode for the display unit to any of a plurality of display modes, including a first display mode in which an image having a gradation resolution which is not higher than a first gradation resolution is displayed, and a second display mode in which an image having a gradation resolution which is higher than the first gradation resolution is displayed; and 
     a control unit configured to control so that in a case where the displaying is in the second display mode and an instruction to switch a first screen including a captured image captured by an imaging unit to a second screen not including a captured image is received, the set display mode is switched from the second display mode to the first display mode, and the second screen is outputted from the output unit. 
     This application claims the benefit of Japanese Patent Application No. 2017-252110, filed on Dec. 27, 2017, Japanese Patent Application No. 2017-251132, filed on Dec. 27, 2017, Japanese Patent Application No. 2017-251259, filed on Dec. 27, 2017, Japanese Patent Application No. 2017-251161, filed on Dec. 27, 2017, Japanese Patent Application No. 2017-251115, filed on Dec. 27, 2017, and Japanese Patent Application No. 2018-212167, filed on Nov. 12, 2018, which are hereby incorporated by reference herein in their entirety.