Abstract:
An image processing apparatus comprising an retrieving unit configured to retrieve a first image file representing a motion image and a second image file representing a still image, a display image file generating unit configured to generate, from the first image file, a first single display image file comprising a plurality of frame images extracted from the first image file; a display control unit configured to display the first single display image file and a second single display image file adjacent to each other, the second single display image file comprising the still image represented by the second image file; a selection accepting unit configured to accept a selection of one from among the first single display image file and the second single display image; and a printing data generation unit configured to generate print data to be used for printing based upon the selection.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority from Japanese Patent Application No. 2008-304803 filed Nov. 28, 2008. The entire content of the priority application is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to a printing device for printing images based on data in an image file. 
     BACKGROUND 
     A conventional printing device well known in the art reads image files representing photographs or other still images (still image files) from a storage medium, and prints out the still images represented by the image files. Recently, there have also been proposals for printing devices capable of printing out not only still image files, but also image files representing motion images (motion image files). 
     Since a motion image represented by a motion image file is configured of an enormous number of frame images, making it impractical to print all of the frame images, the printing device prints only specific frame images extracted from the file. The printing device is configured to be able to printing a plurality of frame images extracted from a motion image file in an arrangement on a single page, for example. 
     The conventional printing device is also configured to display a selection screen including a plurality of image files read from the storage medium, prompting the user to select a desired image file to print. The printing device can also display the first frame image of a motion image file as a thumbnail image. When the user selects a motion image file in the selection screen, the printing device prompts the user to specify frame images to print from the motion image file, and subsequently extracts and prints the specified frame images. 
     However, the conventional printing device described above displays only a thumbnail image of one frame image from the motion image file. Since this frame image may differ from the images that the user will actually be printing, the user must select an image file without knowing exactly what images are available for printing in the motion image file. Thus, in some cases the user will not find a desired printed image in the selected image file and must search through several image files in an effort to find the desired image. 
     SUMMARY 
     In view of the foregoing, it is an object of the present invention to provide a printing device that can assist the user in more efficiently selecting image files from which desired images can be obtained for printing. 
     In order to attain the above and other objects, there is provided a printing device including: an inputting unit that is configured to be capable of inputting at least one image file, each image file representing a motion image; a generating unit that is configured to extract a plurality of frame images from each image file and to generate, for each image file, data of a first output image in which the plurality of extracted frame images are laid out on a single page; a display unit that is configured to display a selection screen in which the display unit displays at least one first display image corresponding to the at least one first output image; a selecting unit that is configured to select one of the at least one first display image displayed; and a printing unit that is configured to print a first output image corresponding to the first display image selected in the selection screen. 
     According to another aspect of the present invention, there is provided a storage medium storing a program executable on a printing device. The program is provided with a set of program instructions including: inputting at least one image file, each image file representing a motion image; extracting a plurality of frame images from each image file and generating, for each image file, a first output image in which the plurality of extracted frame images are laid out on a single page; displaying a selection screen in which at least one first display image corresponding to the at least one first output image is displayed; selecting one of the at least one first display image displayed in the selection screen; and printing a first output image corresponding to the first display image selected in the selection screen. 
     According to further aspect of the present invention, there is provided a storage medium storing a program executable on a computer. The program is provided with a set of program instructions including: inputting at least one image file, each image file representing a motion image; extracting a plurality of frame images from each image file and generating, for each image file, a first output image in which the plurality of extracted frame images are laid out on a single page; displaying a selection screen in which at least one first display image corresponding to the at least one first output image is displayed; selecting one of the at least one first display image displayed in the selection screen; and controlling a printing device to print a first output image corresponding to the first display image selected in the selection screen. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings: 
         FIG. 1  is a block diagram illustrating an electrical configuration of a multifunctional device including a CPU, an internal memory (RAM) and an LCD unit; 
         FIG. 2  is an overview illustrating a series of processes the multifunctional device performs; 
         FIG. 3  is a conceptual diagram explaining storage areas of the RAM in the multifunctional device; 
         FIG. 4  is a view conceptually illustrating an input image data storage area of the RAM; 
         FIG. 5  is a view conceptually illustrating a motion image data storage area of the RAM; 
         FIG. 6A  is an explanatory view showing types of file format of motion image files and corresponding numbers associated therewith; 
         FIG. 6B  is an explanatory view showing types of codec of motion image files and corresponding numbers associated therewith; 
         FIG. 7  is a view conceptually illustrating an LCD position data storage area of the RAM; 
         FIG. 8A  is a view showing an example of a first page of a selection screen shown on the LCD unit of the multifunctional device; 
         FIG. 8B  is a view showing an example of a second page of the selection screen shown in the LCD unit of the multifunctional device; 
         FIG. 9  is a view indicating, vertical and horizontal layout starting positions at which each thumbnail image is arranged to be displayed on the selection screen; 
         FIG. 10  is a view conceptually showing an LCD image storage area of the RAM; 
         FIG. 11  is a flowchart of a media image printing process executed by the CPU of the multifunctional device; 
         FIG. 12  is a flowchart of an output image generation process in the media image printing process; 
         FIG. 13A  is an explanatory view of an output image data storage area in which frame images extracted from a motion image file are laid out; 
         FIG. 13B  is an explanatory view of the output image data storage area in which a still image is laid out; 
         FIG. 14  is a flowchart of an LCD image generating process in the media image printing process; and 
         FIG. 15  is a flowchart of a printing process in the media image printing process. 
     
    
    
     DETAILED DESCRIPTION 
     First, a general configuration of a multifunctional peripheral  10  (hereinafter to be referred to as the “MFP  10 ”) according to an embodiment of the present invention will be described with reference to  FIG. 1 . 
     The MFP  10  is provided with various functions, including a printer function, a scanner function, and a color copier function. As shown in  FIG. 1 , the MFP  10  is provided with a CPU  14 , a ROM  15 , an internal memory (RAM)  16 , an LCD unit  11 , an input unit  12 , a media card slot  13 , a scanning unit  17  and a printing unit  18  that are interconnected with each other by signal lines. 
     The CPU  14  performs all computations for the MFP  10 . The ROM  15  has prestored programs that the CPU  14  executes in order to implement processes described later. The RAM  16  temporarily stores results of computations performed by the CPU  14 , inputted data, and the like. 
     The LCD unit  11  displays images on a compact color liquid crystal display including images of character strings for messages. 
     The input unit  12  has various operating keys that the user can press, and inputs data based on the pressed keys. More specifically, the input unit  12  includes an Up key, a Down key, a Left, key, and a Right key for moving a cursor up, down, left, and right; and an OK key for accepting a selection. The LCD unit  11  and the input unit  12  serve as a user interface of the MFP  10 . 
     The scanning unit  17  scans an image of a document placed on a platen and generates image data representing the scanned image. The printing unit  18  prints image data specified in a print command. 
     The media card slot  13  receives a media card inserted thereinto, such as an SD card and a CompactFlash card (portable, non-volatile storage media). The MFP  10  also has a direct print function for directly reading image files from a media card inserted in the media card slot  13  and printing images represented by the image files. 
     The image files discussed herein include both still image files representing still images; and motion image files representing motion images and configured of a plurality of frame images. When the image file to be printed is a motion image file, the MFP  10  extracts a prescribed number (nine in the present embodiment) of frame images from the plurality of frame images constituting the motion image represented by the motion image file, and prints an image (an output image) having the extracted frame images laid out on a single page (See  FIG. 13A ). When the image file to be printed is a still image file, the MFP  10  prints, as an output image, the still image represented by the still image file on a single page (See  FIG. 13B ). 
     The MFP  10  also displays a selection screen  81  such as that shown in  FIG. 2  on the LCD unit  11 , enabling the user to select an image file to be printed from among the plurality of image files stored on the media card and prints images represented by the selected image files. More specifically, the MFP  10  displays output images for all of the image files that are candidates for printing in the selection screen  81  as thumbnail images, from which thumbnail images the user can tell what the output images will look like when the image files are actually printed (hereinafter referred to as the “print images”). The thumbnail images representing still image files and motion image files are the same size. 
     Next, an overview of a series of processes executed by the MFP  10  will be described with reference to  FIG. 2 . 
     In the processes, the MFP  10  extracts data for nine frame images from each motion image file and generates data of an output image by sequentially laying out each of the nine extracted frame images in a storage area (output image data storage area  33 ) representing a single page, as shown in  FIG. 13A . The MFP  10  also generates data of an output image for each still image file in which only one still image represented by the still image file is laid out on a single page, as shown in  FIG. 13B . Next, the MFP  10  displays the output image for each image file as a thumbnail image in the selection screen  81  after reducing or enlarging the output image to a prescribed size. When the user selects an image file, the MFP  10  prints the output image of the selected image file. 
     Next, storage areas of the RAM  16  will be described with reference to  FIGS. 3 through 10 . 
     As shown in  FIG. 3 , the RAM  16  is configured with various storage areas for storing different types of data. The storage areas include an input image data storage area  31 , a motion image data storage area  32 , an output image data storage area  33 , an enlarged/reduced image data storage area  34 , a frame image data storage area  35 , a print data storage area  36 , a temporary variable storage area  37 , an LCD position data storage area  38 , and an LCD image storage area  39 . 
     The input image data storage area  31  serves to store data on image files stored on a media card inserted in the media cart slot  13 . As shown in  FIG. 4 , the input image data storage area  31  is divided into an input image ID storage area  51 , an input image filename storage area  52 , and an input image file size storage area  53 . 
     The input image ID storage area  51  serves to store IDs for image files stored on the media card. The IDs are assigned sequentially beginning from 0 based on the number of image files (hereinafter referred to as “input image IDs”). The input image IDs are assigned to the image files in the order that the files are read from the media card. 
     The input image filename storage area  52  serves to store filenames of the image files. The input image filename storage area  52  is a 256-byte region, with each byte capable of storing data for one character. 
     The input image file size storage area  53  serves to store numerical values (values in units of kilobytes in this example) indicating the file sizes of the image files. 
     The motion image data storage area  32  serves to temporarily store data read from the media card for a motion image file being processed. As shown in  FIG. 5 , the motion image data storage area  32  is provided with a format type storage area  61 , a codec type storage area  62 , a horizontal size storage area  63 , a vertical size storage area  64 , a total frame number storage area  65 , an extraction position data storage area  66  and an extraction size data storage area  67 . 
     The format type storage area  61  stores data of a type of file format for the motion image file being processed. In the present embodiment, the format type storage area  61  may store one of the values 0, 1, or 2 that have been preassigned to one of three file formats, as shown in  FIG. 6A . 
     The codec type storage area  62  stores data of a type of codec for the motion image file being processed. In the present embodiment, the codec type storage area  62  may store one of the values 0, 1, or 2 that have been preassigned to one of three types of codecs, as shown in  FIG. 6B . 
     The horizontal size storage area  63  stores numerical data indicating the number of pixels in the horizontal direction of the motion image file (frame image) being processed. 
     The vertical size storage area  64  stores numerical data indicating the number of pixels in the vertical direction for the motion image file (frame image) being processed. 
     The total frame number storage area  65  stores numerical data indicating a total number of frame images (number of frames) constituting the motion image file being processed. 
     The extraction position data storage area  66  stores data identifying where each of nine frame images extracted from the motion image file being processed is positioned within the motion image file. More specifically, the extraction position data storage area  66  stores numerical values (values in units of bytes in this example) indicating an amount of offset from the beginning of the motion image file to the start of data for each frame image. A motion image file is configured of data for frame images arranged sequentially between header data at the beginning of the file and index data at the end of the file. Thus, the amount of offset is a value indicating the size of data from the start of the motion image file (the start of the header data in this case) to the start of frame image data targeted for extraction. The amount of offset is stored in units of bytes rather than kilobytes in order to accurately identify the position from which the frame image data begins. 
     In the present embodiment, the MFP  10  automatically identifies nine frame images, including the first image (the first frame), the last image (the last frame), and seven images (seven frames) distributed equally therebetween, by dividing the total number of frames in the motion image file in eight equal intervals. Specifically, the MFP  10  extracts the nine frame images from the motion image file in chronological order and lays out and prints these frame images in the same order.  FIG. 13A  illustrates the layout of nine frame images denoted as 0 th  through 8 th  frames. Further, rather than referencing the total number of frames, the motion image file may be divided into eight equal time intervals by referencing the playback time of the motion image, for example. 
     The extraction size data storage area  67  stores data sizes of the frame image data (in a compressed format) for the extracted nine frame images and also has nine storage areas like the extraction position data storage area  66 . Each of these storage areas serves to store a numerical value (a value in units of bytes, for example) indicating the data size of the corresponding frame image. 
     The nine areas of the extraction position data storage area  66  are correlated with the nine areas of the extraction size data storage area  67 . Thus storage areas with the same layout position hold data related to the same frame image. 
     The output image data storage area  33  serves to temporarily store output image data for a motion image file by sequentially laying out nine frame images extracted from the motion image file as shown in  FIG. 13A , and to temporarily store output image data for a still image file by laying out one still image represented by the still image file as shown in  FIG. 13B . 
     The enlarged/reduced image data storage area  34  serves to store enlarged/reduced image data generated by converting (expanding or reducing) the output image data to a predetermined thumbnail image size. 
     The frame image data storage area  35  serves to store frame image data extracted from a motion image file. The frame image data stored in this region is in a compressed state (the JPEG format, for example) and has not yet been expanded (decoded). 
     The print data storage area  36  serves to temporarily store print data for actual printing that has been produced by converting the output image data. 
     The temporary variable storage area  37  serves to temporarily store variables and counters, such as a page no. counter, cursor position counter, processing page no. variable, generated image counter, process frame image counter, output image pixel counter, and line counter. These variables and counters are used during various processes executed by the CPU  14 , as will be described later. 
     The LCD position data storage area  38  serves to store data indicating a display page (described later) of the selection screen  81 , and a display position at which each thumbnail image is to be positioned. As shown in  FIG. 7 , the LCD position data storage area  38  is provided with an input image ID storage area  71 , a display page no. storage area  72 , a display image position number storage area  73 , a horizontal display coordinate storage area  74  and a vertical display coordinate storage area  75 . 
     The input image ID storage area  71  stores input image IDs for the image files, which correspond to the input image IDs stored in the input image ID storage area  51  of the input image data storage area  31 . 
     The display page no. storage area  72  stores, for each input image ID, a page number of the selection screen  81  on which the thumbnail image for the corresponding image file should be displayed. Since there is a limit to the number of thumbnail images that can be displayed simultaneously on the LCD unit  11  (three in the present embodiment), the user must switch among a plurality of pages of the selection screen  81  when the number of selectable image files exceeds this limit. 
     The display image position number storage area  73  stores one of the numbers 0, 1, and 2 to indicate the position at which each thumbnail image should be displayed on the selection screen  81  (0 th , or 2 nd  position from the left). Now assume that four image files are stored on the media card and are assigned input image IDs of 0, 1, 2 and 3. In this case, thumbnail images  91   a ,  91   b  and  91   c  for the image files having IDs of 0-2 are displayed on a first page of the selection screen  81  respectively at left, center and right positions, as shown in  FIG. 8A , and the remaining thumbnail image  91   d  for the image file having ID of 3 is displayed at the left position on a second page, as shown in  FIG. 8B . 
     The horizontal display coordinate storage area  74  stores data for a horizontal image layout starting point indicating a horizontal starting point at which each thumbnail image is to be displayed on the LCD unit  11 . 
     The vertical display coordinate storage area  75  stores data for a vertical image layout starting point indicating a vertical starting point at which each thumbnail image is to be displayed on the LCD unit  11 . Each circle in  FIG. 9  shows positions corresponding to each combination of coordinates stored in the horizontal display coordinate storage area  74  and the vertical display coordinate storage area  75 . 
     The LCD image storage area  39  serves to store thumbnail images to be displayed simultaneously on the LCD unit  11 . Specifically, as shown in  FIG. 10 , the LCD image storage area  39  has a plurality of sub-regions for storing thumbnail images, each sub-region being assigned one of the position numbers 0 th , 1 st  and 2 nd  that correspond to the numbers (0, 1 and 2) stored in the display image position number storage area  73 . The thumbnail images  91   a ,  91   b ,  91   c  are respectively stored in the sub-regions of the position numbers 0 th , 1 st , and 2 nd , to display the first page of the selection screen  81 . The thumbnail image  91   d  is stored in the sub-region of the position number 0 th  to display the second page of the selection screen  81 . 
     Next, processes executed by the CPU  14  will be described in detail with reference to  FIGS. 11 through 15 . 
     The CPU  14  of the MFP  10  performs the following processes (1)-(4): 
     (1) a media image printing process; 
     (2) an output image generating process; 
     (3) an LCD image generating process; and 
     (4) a printing process. 
     The CPU  14  executes the media image printing process (process (1) described above) when the user performs an operation on the input unit  12  to select a ‘media image printing mode’ while a media card storing image files is inserted in the media card slot  13 . The other processes (2)-(4) are executed as subroutines called during the media image printing process. 
     First, the media image printing process executed by the CPU  14  of the MFP  10  will be described while referring to a flowchart in  FIG. 11 . 
     In S 101  at the beginning of this media image printing process, the CPU  14  reads data (a filename and file size) for one image file stored in the media card. 
     In S 102  the CPU  14  stores the data read in S 101  in the input image data storage area  31  in association with one input image ID. The CPU  14  further stores the input image ID and display page and position data for the subject image file (data of a display page and position at which a thumbnail image for the subject image file should be displayed) in the input image ID storage area  71 , the display page no. storage area  72 , the display image position number storage area  73 , the horizontal display coordinate storage area  74  and the vertical display coordinate storage area  75  in the LCD position data storage area  38 . 
     In S 103  the CPU  14  determines whether data for all image files stored in the media card has been re-ad. 
     If the CPU  14  determines that data for all image files has not been read (S 103 : NO), the CPU  14  returns to S 101  and reads data for one of the remaining image files. 
     However, if data has been read for all image files (S 103 : YES), in S 104  the CPU  14  initializes both of the page no. counter and the cursor position counter (prestored in the temporary variable storage area  37 ) to 0. The page no. counter represents on which page a cursor image  82  (see FIG.  8 AB) is currently being located among all the pages available in the selection screen  81 . The cursor position counter represents the position at which the cursor image  82  is currently being located, among the three thumbnail images simultaneously displayed on one page of the selection screen  81 . The page no. counter and the cursor position counter are interlocked with the user&#39;s operations of the Up, Down, Left and Right keys in the input unit  12 . 
     In S 105  the CPU  14  determines whether the page no. of the selection screen  81  has been updated. Specifically, the processing page no. variable is prestored in the temporary variable storage area  37  for representing a page no. on which an image file currently being processed is located among all the pages available in the selection screen  81 . The processing page no. variable is given an initial value of −1. The CPU  14  determines whether the page no. of the selection screen  81  has been updated by the user by comparing the value of the processing page no. variable with the value of the page no. counter, and judges that the page no. has been updated by the user when the two values are different. The processing page no. variable has been set to an initial value of −1 to ensure that the CPU  14  makes a YES determination the first time S 105  is performed. After reaching a YES determination in S 105 , before executing the process of S 106 , the processing page no. variable is updated to match the value of the page no. counter. 
     When the CPU  14  determines that the values of the processing page no. variable and the page no. counter are different from each other, i.e., the CPU  14  determines that the page no. was updated by the user (S 105 : YES), in S 106  the CPU  14  sets the input image ID of an image file to be processed (target image file). Here, specifically, the generated image counter has been stored in the temporary variable storage area  37  for counting how many output images have been generated for being displayed on one page of the selection screen  81 . The CPU  14  assigns the input image ID for the target image file with an input image ID that is stored in the input image ID storage area  71  in association with a combination of the value in the display page no. storage area  72  that is equal to the value of the page no. counter and the value in the display image position number storage area  73  that is equal to the value of the generated image counter. The value stored in the generated image counter is always reset to 0 when the CPU  14  advances from S 105  to S 106 . 
     In S 107  the CPU  14  executes the output image generating process (process (2) described above) on a targeted image file whose input ID has been set in S 106 . In S 107 , the CPU  14  generates output image data for the targeted image file (image data representing an image to be printed) in the output image data storage area  33 . Details of the output image generating process will be described later with reference to  FIG. 12 . 
     In S 108  the CPU  14  executes the LCD image generating process (process (3) described above) on the output image data stored in the output image data storage area  33  (as a result of the output image generating process executed in S 107 ) to generate a thumbnail image for the targeted image file and stores the thumbnail image in the LCD image storage area  39  at a position having the position number indicated by the generated image counter. Details of the LCD image generating process will also be described later. 
     In S 109  the CPU  14  determines whether one screenful of thumbnail images has been generated. The CPU  14  increments the generated image counter by 1 in S 109  upon determining that one screenful of thumbnail images has not been generated (S 109 : No) and returns to S 106  to generate another thumbnail image. 
     Specifically, in S 109  the CPU  14  determines whether one screenful of thumbnail images has been generated based on whether the value of the generated image counter has reached the maximum number of images that can be displayed in one screen (since three images can be displayed simultaneously in the selection screen  81  in the present embodiment, the maximum image number is set to two because the initial value of the generated image counter is 0). 
     Further, if there are less than three thumbnail images in the last page to be displayed on the selection screen  81 , the CPU  14  determines that one screenful of thumbnail images has been generated by referring to the input image ID in addition to the value of the generated image counter. If the input image ID indicates the target image file is the last file, even though the value of the generated image counter does not reach the maximum number (i.e., the current value of the generated image counter remains either 0 or 1 in this example), the CPU  14  does not endlessly repeat the process S 106 -S 109  but determines that one screenful of thumbnail images has been generated in S 109 . 
     When one screenful of thumbnail images is determined to have been generated (S 109 : YES), in S 110  the CPU  14  displays the image data stored in the LCD image storage area  39  on the LCD unit  11 , and subsequently advances to S 111 . 
     The CPU  14  also jumps to S 111  after determining in S 105  that the page no. was not updated by the user. 
     In S 111  the CPU  14  displays a cursor image  82  on the selection screen  81  at a position associated with the cursor position counter. As shown in  FIGS. 8A and 8B , the cursor image  82  in the present embodiment is a yellow border surrounding a thumbnail image displayed on the selection screen  81  in the LCD unit  11 . 
     In S 112  the CPU  14  receives data inputted from the input unit  12  when the user presses an operating key in the input unit  12 . 
     In S 113  the CPU  14  determines based on the data inputted in S 112  whether the pressed key was the OK key or another key, such as the Up key, Down key, Left key, or Right key. 
     If the CPU  14  determines in S 113  that the pressed key was a key other than the OK key, in S 114  the CPU  14  updates the page no. counter and/or the cursor position counter. 
     For example, when the pressed key was the Down key or Right key, the CPU  14  increments the cursor position counter by 1 in order to move the position of the cursor image  82  rightward one place. However, if the value of the cursor position counter exceeds the maximum value (2 in the present embodiment since the counter was initially set to 0) as a result of this increment, such as when the Down key or Right key was pressed when the cursor image  82  is in the rightmost position, the CPU  14  resets the cursor position counter to 0 and increments the page no. counter by 1. In this case, if the value of the page no. counter would exceed the maximum value (the page number of the last page −1, since the counter is initially set to 0) as a result of this increment, i.e., when there is no next page, the CPU  14  maintains the page no. counter at the maximum value without incrementing the counter. 
     On the other hand, if either the Up key or Left key was pressed in S 113 , the CPU  14  decrements the cursor position counter by 1 in order to move the position of the cursor image  82  leftward one place. In this case, if the value of the cursor position counter would be less than 0 following this decrementing operation, such as when the Up key or Left key was pressed when the cursor image  82  was already in the leftmost position, the CPU  14  resets the cursor position counter to 0 and decrements the page no. counter by 1. In this case, if the value of the page no. counter would be less than 0 as a result of the decrementing operation, i.e., when no previous page exists, the CPU  14  maintains the value of the page no. counter at 0 without decrementing the counter. 
     The CPU  14  returns to S 105  after finishing S 114 . 
     However, if the CPU  14  determines in S 113  that the pressed key was the OK key, in S 115  the CPU  14  assigns the input image ID for an image file to be printed with an input image ID that is stored in the input image ID storage area  71  in association with a combination of the value of the display page no. storage area  72  that is equal to the current value of the page no. counter and the value of the display image position number storage area  73  that is equal to the current value of the cursor position counter. 
     In S 116  the CPU  14  executes the output image generating process on the image file having the input image ID set as the printing target in S 115 . As a result of this process, output image data for the targeted image file (image data representing the print image) is generated in the output image data storage area  33 . 
     In S 117  the CPU  14  executes the printing process (process (4) described above) on the output image data stored in the output image data storage area  33  as a result of the output image generating process executed in S 116  and subsequently ends the current media image printing process. Details of the printing process will also be described later. 
     Next, the output image generating process (process (2) described above) executed in S 107  and S 116  of the media image printing process will be described with reference to a flowchart in  FIG. 12 . The output image generating process is configured to be executed in S 107  on the image file whose ID has been set in S 106  to be displayed on the selection screen  81 , while to be performed in S 116  on the image file whose ID has been set in S 115  as a target to be printed. 
     In S 201  at the beginning of the output image generating process, the CPU  14  determines the type of the targeted image file by referencing the header data therein. Specifically, the CPU  14  refers to the filename stored in the input image filename storage area  52  in association with the ID of the targeted image file in the input image data storage area  31 . By using the filename, the CPU  14  directly accesses the target image file stored on the media card and refers to the header data therein. 
     In S 202  the CPU  14  determines whether the type of image file determined in S 201  is classified as a still image file or a motion image file. 
     If the CPU  14  determines in S 202  that the image file is a motion image file, then in S 203  the CPU  14  executes a process to analyze the motion image file. Through this analytical process, the CPU  14  acquires format type data and codec type data for the motion image file. The CPU  14  stores these data respectively in the format type storage area  61  and codec type storage area  62  of the motion image data storage area  32  (See  FIG. 5 ). 
     In S 204  the CPU  14  executes a process to extract motion image parameters from the motion image file. Through this extraction process, the CPU  14  acquires horizontal size data, vertical size data, and total frame number data for the motion image file; and the extraction position data and extraction size data for each of the nine frames to be extracted. The CPU  14  stores these data respectively in the horizontal size storage area  63 , vertical size storage area  64 , total frame number storage area  65 , extraction position data storage area  66 , and extraction size data storage area  67  of the motion image data storage area  32 , as shown in  FIG. 5 . If data for a different motion image file has already been stored in the motion image data storage area  32  at this time, the CPU  14  first deletes the existing data before storing the data for the motion image file currently being processed (overwrites the existing data). 
     In S 205  the CPU  14  performs a process to read, from the motion image file, data of a frame image to be processed from among the nine frame images (0 th  through 8 th  frames) based on the extraction position data and extraction size data stored in the extraction position data storage area  66  and extraction size data storage area  67 , respectively. Here, the process frame image counter prestored in the temporary variable storage area  37  is given an initial value of 0, and the CPU  14  targets data for the frame image corresponding to the value of the process frame image counter. As will be described later, the value of the process frame image counter is incremented after processing data for each frame image. 
     In S 206  the CPU  14  stores the frame image data read in S 205  in the frame image data storage area  35 . 
     In S 207  the CPU  14  performs an expansion (decoding) process on the frame image data stored in the frame image data storage area  35  and converts this data to a format in which pixel calculations are possible (such as image data expressing RGB values for each pixel as numerical values from 0 to 255). 
     In S 208  the CPU  14  stores or lays out the pixel data expanded in S 207  at a position in the output image data storage area  33  corresponding to the frame image being processed. When executing S 208 , if output image data for another image file has already been stored in the output image data storage area  33 , the CPU  14  first deletes the existing output image data before storing the new output image data for the currently targeted image file (i.e., overwrites the existing data). 
     In S 209  the CPU  14  determines whether the expansion process and layout process have been performed for all frame images. Specifically, the CPU  14  increments the process frame image counter by 1 each time processing of S 207 -S 208  for one frame image is completed. The CPU  14  determines that the expansion process and layout process have been performed on all frame images when the value of the process frame image counter reaches the value (the number of frame images to be laid out −1), i.e., eight in the present embodiment. 
     If the CPU  14  determines that the expansion process and layout process have not been completed for all frame images (S 209 : NO), the CPU  14  returns to S 205  and repeats the above process on data for an unprocessed frame image By repeatedly executing the processes of S 205 -S 209 , the CPU  14  lays out the nine frame images in their order of extraction (i.e., based on their positional order in the motion image), as illustrated in  FIG. 13A . In the present embodiment, a margin is provided around each frame image when the frame images are laid out, but this margin is not necessarily required. 
     However, if the CPU  14  determines that the expansion process and layout process have been completed for all frame images (S 209 : YES), the CPU  14  ends the current output image generating process. At this time, the image data stored in the output image data storage area  33  (pixel data representing an image in which nine frame images are laid out) is the output image data for the motion image file. 
     On the other hand, if the CPU  14  determines in S 202  described above that the image file is a still image file, then in S 210  the CPU  14  performs an expansion process on the still image file to convert the image data in the still image file to a format in which pixel calculations are possible. 
     In S 211  the CPU  14  stores the image data expanded in S 210  in the output image data storage area  33 , and subsequently ends the current output image generating process. In other words, for still image files, unlike motion image files, a single still image is laid out in the output image data storage area  33 , as illustrated in  FIG. 13B . At this time, the image data stored in the output image data storage area  33  (pixel data representing a still image) is the output image data for the still image file. 
     Next, the LCD image generating process (process (3) described above) executed in S 108  of the media image printing process will be described with reference to a flowchart in  FIG. 14 . The LCD image generating process is configured to be executed on the output image data that has been generated in S 107  for the targeted image file whose ID has been set in S 106 . 
     In S 301  at the beginning of the LCD image generating process, the CPU  14  executes a process to enlarge or reduce the targeted image data (the output image data stored in the output image data storage area  33 ). Here, through this enlargement/reduction process, the CPU  14  generates an enlarged/reduced image (thumbnail image) by converting (enlarging or reducing) the targeted image data to a predetermined size for thumbnail images. The CPU  14  determines whether to execute an enlargement process or a reduction process by comparing the pixel size of the targeted image data with the pixel size of thumbnail images to be displayed on the LCD unit  11 . 
     Usually the reduction process is performed on the targeted image data since the pixel size of the targeted image data is normally greater than that of the thumbnail images. However, conceivably, the pixel size of the output image data could be smaller than that of the thumbnail images, in which case the enlargement process would be executed on the targeted image data. It is also conceivable that the pixel size of the targeted image data could be the same as that of the thumbnail images, in which case it is not necessary to perform an enlargement or reduction process on the image data. The enlargement and reduction processes are performed using well known algorithms, such as the nearest neighbor algorithm, bilinear algorithm, or bicubic algorithm, to generate an enlarged/reduced image one pixel at a time. 
     In S 302  the CPU  14  stores the image data resulting from the enlargement/reduction process of S 301  in the enlarged/reduced image data storage area  34 . 
     In S 303  the CPU  14  determines whether the enlargement/reduction process has been executed on all pixels in the targeted image data. In the present embodiment, the output image pixel counter has been prestored in the temporary variable storage area  37  for counting the number of pixels on which the enlargement/reduction process has already been completed. The output image pixel counter is given an initial value of 0. The CPU  14  increments this output image pixel counter by one each time the process in S 301  is performed. The CPU  14  determines that the enlargement/reduction process has been executed for all pixels in the targeted image when the value of the output image pixel counter reaches the number of pixels in the targeted image data. 
     The CPU  14  returns to S 301  upon determining in S 303  that the enlargement/reduction process has not been executed for all pixels in the targeted image (S 303 : No). 
     However, if the CPU  14  determines that the enlargement/reduction process has been completed for all pixels (S 303 : YES), in S 304  the CPU  14  copies the data stored in the enlarged/reduced image data storage area  34  to a region of the LCD image storage area  39  that is associated with a display position number for the targeted image file (see  FIG. 10 ) which is indicated by the current value of the generated image counter. Subsequently, the CPU  14  ends the LCD image generating process. 
     Next, the printing process (process (4) described above) executed in S 117  of the media image printing process will be described with reference to a flowchart in  FIG. 15 , The printing process is executed on the output image data generated and stored in the output image data storage area  33  in S 116 . 
     In S 401  at the beginning of the printing process, the CPU  14  copies one line worth of the output image data stored in the output image data storage area  33  to the print data storage area  36 . If the size of the output image is 1600 pixels horizontally×1200 pixels vertically, for example, one line would be 1600×1 pixels. 
     In S 402  the CPU  14  performs color space conversion for converting pixel data in the print data storage area  36  from RGB values to CMYK values. More specifically, the CPU  14  performs an RGB→CMY conversion on the pixel data using a color conversion method well known in the art, and performs CMY→CMYK conversion on the resulting data using a GCR process well known in the art. 
     In S 403  the CPU  14  converts the pixel data in the print data storage area  36  to binary data for printing in each of the CMYK colors. This binary conversion is performed using processes well known in the art, such as the error diffusion method and dither matrix method. 
     In S 404  the CPU  14  outputs the binary data produced in S 403  to the printing unit  18 , whereby the printing unit  18  performs a printing operation based on this binary data. 
     In S 405  the CPU  14  determines whether the above process has been completed for all lines of the output image data. In the present embodiment, the line counter having an initial value of 0 has been prestored in the temporary variable storage area  37 . The CPU  14  increments this line counter by one each time the process described above has been completed for one line. The CPU  14  determines whether the process has been completed for all lines of the output image data when the value of the line counter reaches the number of lines of the output image data stored in the output image data storage area  33 . 
     The CPU  14  returns to S 401  when determining in S 405  that there remain lines to be processed (S 405 : No). 
     When the process has been completed for all lines (S 405 : YES), the CPU  14  ends the current printing process. 
     As described above, the MFP  10  according to the present embodiment displays the selection screen  81  with which a user can select an image file to print. The MFP  10  displays images in the selection screen  81  for selecting image files that are candidates for printing. The displayed images give the user a good idea of what the actual printed image will look like if the image file is selected. Accordingly, the user of the MFP  10  can more effectively select image files to obtain desired printed images. 
     In other words, if only a thumbnail image of one frame image from the motion image file were displayed, this frame image may differ from the images that the user will actually be printing. Hence, the user must select an image file without knowing exactly what images are available for printing in the motion image file. Thus, in some cases the user will not find a desired printed image in the selected image file and must search through several image files in an effort to find the desired image. The MFP  1  according to the present embodiment solves this problem by displaying images the same as print images in the selection screen  81  for selection. 
     Further, since the MFP  10  of the present embodiment can print an image in which a plurality of frame images has been laid out on the same page, the MFP  10  is configured to display an image having a combination of frame images as a thumbnail image for selection. Arranging a plurality of frame images on a single page also enables the user to more easily identify the content of a motion image than when only one frame image of the motion image is displayed as a selectable image. Printing a plurality of images on a single page is more suited to motion images than still images, particularly when the frame images of the motion image are smaller in size than the still images, since frame images of a motion image may appear grainy and poorer in quality when printed at an enlarged size. 
     The MFP  10  of the present embodiment can also allow the user to select an image file to be printed from among a combination of motion image files and still image files. This eliminates the inconvenience of having to select motion image files and still image files using different modes when both file types are stored on the same media card. 
     Further, since the MFP  10  of the present embodiment displays a row of thumbnail images for a plurality of image files in the selection screen  81  as selectable images, the user can compare output images of different image files when selecting an image file to print. 
     While the present invention has been described in detail with reference to the embodiment thereof, it would be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention. 
     For example, the MFP  10  according to the present embodiment described above automatically identifies nine frame images to be extracted from a motion image file, but the present invention is not limited to this configuration. For example, the MFP  10  may prompt the user to select which frame images are to be extracted. Further, the number of frame images to be extracted from a motion image file is not limited to nine and need not be fixed to any specific number. The user may be prompted to specify the number of frame images to be extracted. 
     Further, the present invention has been applied to a multifunctional peripheral as an example of printing devices according to the present embodiment, but the present invention may also be applied to a printing device other than a multifunctional device, such as a printer without scanning function. 
     Further, the present invention may also be applied to a computer connectable with a printing device. In this case, a driver program for controlling operations of the connected printing device is installed on a ROM, an HDD or the like in the computer. By executing the driver program, the computer performs the above-described processes (1) to (4), just like the MFP  10 . That is, the computer reads image files (motion image files and still image files) from a media card inserted in the computer, generates output images for each image file, displays thumbnail images corresponding to the output images on a display unit of the computer for selection, and controls the printing device to print an output image corresponding to the thumbnail image selected by a user. The driver program may be originally stored on a recording medium, such as a CD-ROM, and installed on the computer.