User interface comprising hue shift control for color printing

Abstract: The present invention relates to a control system for a color printing apparatus including a user interface having a selective control with an indicator of a user preference in order to represent an effect of the user preference to the output . The system comprises an illustrative representation of an adjustable color spectrum and a dynamic image representation of the effect on the output.

Description: The present invention relates to xerography or printing systems, in particularly, those systems having a color print output. More specifically, the subject invention relates to a user interface for selectively adjusting hue of a color print. However, it will be appreciated to those skilled in the art that the invention could be readily adapted for other adjustable features of a print or display output as, for example, chroma, luminescence, or where similar user interfaces are employed to implement operator preferences. The printing or display of image information via a printer, copier, or personal computer can be controlled by an operator through a variety of interfaces is e.g. known from EP-A-0 773 667. Common interfaces comprise a number of systems and devices such as a combination touch pad and display screen, a keypad or a mouse control often accessing a tool bar for icon display of system features and options, all having some capacity for controlling a printer or display. To facilitate operator ease of use of the interface controls, such systems are known to include a representative illustration identifying a consequence of a control command. Such illustrations typically comprise an icon which will represent a state or change of state in response to a user instruction. A common example is a representation of paper size in a copying system as the user adjusts printing output from letter, to A4 to legal or other sizes. A problem with such representative icons is that they fail to communicate an accurate identification of consequences of subtle appearance changes in the output such as may occur in color printing from minor adjustments of the input controls. In particular, an icon representing a system state may fail to adequately communicate an accurate indication of the system output. On the other hand, where a number of controls are being adjusted, an icon identifying relative adjustment away from a preexisting default state, can merely identify a tendency away from the default state, but also cannot accurately and adequately represent the consequence on the output. For example, adjustments in hue control such as hue shift are usually available to a user to satisfy a particular user's preferences. The phrases "hue shift" or "hue control" are used to describe the changes in the attributes of the perceived color by an operator throughout a full color spectrum. Such a spectrum is directly related to different light wave lengths as perceived by a human user and, for example, will comprise a continuous color spectrum comprising red, yellow, green, blue, purple and magenta. Figure 1 shows a prior art implementation of a control interface for a color copier for shifting color hue. The interface comprises a screen on an LCD display also including touch screen controls. In this implementation, concentric color spectrum rings are used to suggest an effect of a user adjustment. More particularly, the inner ring 10 defines a reference of the red, yellow, green, cyan, blue and magenta spectrum as an indicator of how the colors of the original input image should be perceived by the copier system. The outer ring 12 comprises an identical spectrum which at a default state is exactly aligned with the inner ring to indicate that the output print will have an identical system hue as the input hue. However, a user upon checking the print output, may determine that the output hue is unacceptable or improvable. As a practical matter, most users will endeavor to shift color hue in an effort to improve skin tone of the output print image, but present systems provide no representative image which is more accurately indicative of how the shift will affect the overall output, and the user will often have to step through a number of copy operations until, by trial and error, an acceptable print output is obtained. Without such trial and error operations, it is very difficult for an operator to envision changes to a color hue as they are implemented throughout the entire spectrum of output print colors merely as a consequence of trying to improve a skin tone so that such effort can be a tedious problem to overcome More specifically and with reference to a copying operation, this feature allows a shift in all of the colors towards the adjacent hue. Another example of where this can be useful is when the document being copied does not have quite the correct colors for the application. By touching one of the two arrow buttons ( 14, 16 ) one can cause the overall copy colors to be shifted. The inner color ring 10 represents the colors of the document being copied and rotates to indicate the direction in which the colors shift. The outer ring 12 represents the colors that appear on the copy (not shown). For example, if the right arrow button 14 is selected, the red colors R shift towards the yellow hue Y , blue colors B shift towards the magenta hue M , and green colors G , shift towards the cyan hue C . All colors in between these colors also shift in the same direction. If the left arrow button 14 is selected, the red colors R shift towards the magenta hue M , blue colors B shift towards the cyan hue C , and green colors G shift towards the yellow hue Y . Again, all colors in between these colors also shift in the same direction. The interface system of Figure 1, although suggesting a shift in color hue, fails to apprise a user of an accurate consequence of the shift for an adequate determination of how much or how little shift is appropriate. Trial and error must be used. It is the object of the present invention to improve a user interface particularly with regard to provide evidence to the user with regard to the consequences of input commands. This object is achieved by providing a control system for a color printing apparatus according to claim 1. Embodiments of the invention are set forth in the dependent claims. One benefit obtained by use of the present invention is a control system wherein the user interface provides a dynamic image representation as part of a display or control panel wherein a direct indication is displayed of the effect of a change or shift in the feature of the output resulting from the user command. The image is represented in concert with a reference representation of a spectrum of printed attributes for accurately communicating an identified change in a basic spectrum relative to the associated image representation. Referring now to the drawings wherein the showings are for purposes of illustrating the preferred embodiments of the invention only and not for purposes of limiting same, the Figure 2 shows a color shift controller 20 including a control panel/display 22 to be used as a user interface for controlling color hue in a printer output 24 such as is useful in a color copier 26 or the like. With particular reference to Figure 3A, a specific embodiment of the control panel 22 is shown. Such a control panel typically comprises an LCD display comprising an integral part of the copier 26 ; however, other displays are possible such as a CRT. In contrast to Figure 1, the spectrum of color hue representing the colors of the document being copied are presented in the form of a bar, as opposed to a ring. In actual fact, the spectrum is of course continuous so that a circle may be considered a more accurate representation of the spectrum. However the bar 32 comprises an overlap in colors for conveying this aspect. More particularly, the bar as shown identifies the range as magenta 34 , red 36 , yellow 38 , green 40 , blue 42 , purple 44 and then magenta 46 and red 48 are repeated. The bar 32 is fixed but comprises an illustrative representation of an adjustable color spectrum thereby suggesting a color range of an appearance of the output to the user. In other words, all the colors on the document that is being copied are presented to the user by the spectrum bar 32 . Slide bar 52 also comprises a complete spectrum of color comprised of color blocks sized identically to the reference bar 32 and range from red 54 , yellow 56 , green 58 , blue 60 , purple 62 , and magenta 64 . Slide bar 52 moves in parallel relative motion to color bar 32 and in the form of this particular display has five relative positions relative to the color bar 32 . These positions are displayed as -2, -1, 0, + 1 and +2. These relative positions are shown in Figures 3A - 3E, respectively. Figure 3B shows the default setting -1. Figure 3C illustrates the factory default setting wherein the slide bar 52 is aligned at an "0" position so that the output print is intended to exactly match the perceived colors of the document being copied. In other words, the system intends to exactly match the hue of the input document and the output document. In the position of Figure 3C, it can be seen that the color blocks of each slide bar are directly aligned in adjacent positions to indicate that the reds, yellows, greens, etc. of the input document should exactly match the reds, yellows, greens, etc. of the output document. The fact that the system is set at factory default, or the "0" position is indicated in the display box 72 (see Figure 3A) where the "0" is indicated. More importantly, though, a dynamic image representation 76 is also included within the display 22 comprising an actual picture preferably illustrating a skin-tone color as well as a spectrum of other colors. The effect of the picture representation 76 is that the adjustment communicated by the operator can now more accurately represent the effect of hue shifts on the overall picture and can be communicated and perceived in combination with relative movements between color bars 32 and 52 . A hue shift is affected by an operator touching the touch pads 82 , 84 , so that the slide bar 52 can move to one of the five positions relative to spectrum bar 32 as noted above. With reference to Figures 3C and 3D, if the operator moves the slide bar 52 from the default or neutral position as shown in Figure 3C, to the "+1" position shown in Figure 3D, the effect of the hue shift is that the reds will become more yellow, the yellows will become more green, the greens will become more blue, the blues will become more purple, the purples will become more magenta and the magentas will become more red. In one aspect, the invention indicates this as a result of the shift in overlap between the two bars 52 , 32 , but in a more clear manner than is conveyed by the concentric ring arrangement shown in Figure 1. The definition of the relative shift between -2, -1, 0, +1 and +2 positions provides an easily identifiable first communication technique for hue shift. More importantly though, the inclusion of the image 76 allows an operator to quickly and accurately appreciate the effect of the hue shift commands. The reference image 76 thus provides an important additional reference point to the concurrent movement of the slide bar 52 . The subject invention comprises a control mechanism operating as a user interface for shifting the color hue wherein the color mechanism is accompanied by a photograph, serving as a reference image, that changes in accordance with the commands to shift the hue and more accurately reflect the changes requested by the user. Another feature of the invention is that of the five different settings of the slide bar 64 any of one of the modes, not necessarily the factory default setting of"0", could be set as a default position. Implementation of the adjustable default is accomplished through a tools dialog represented in the tool bar section of the display 22 . In addition, although a touch pad 82, 84 implementation has been shown as the preferred embodiment, the subject control mechanism could be implemented through a mouse or a finger slide.

Claims: A control system for a color printing apparatus (26) including a user interface (22) for selectively adjusting a print output, the system comprising: an illustrative representation of an adjustable color spectrum (32) suggesting a color range of an appearance of the output; the user interface (22) having a selective control (82, 84) including an indicator (72) of a user input command and for representing an effect of the user input command on the output; and a dynamic image representation (76) of the effect on the print output for communicating an adjustment in the appearance of the print output in accordance with an implementation of the user input command, wherein the adjustable output comprises a color hue and the selective control (82, 84) comprises a slide bar (52) suggestive of a color hue spectrum. The control system as defined in claim 1, wherein the selective control (82, 84) comprises a user interface display device having a touch-sensitive mechanism or overlay (82, 84). The control system as defined in claim 1, wherein the dynamic image representation (76) includes a skin tone portion displayed in an environment including a full representation of the color spectrum. The control system as defined in claim 3, wherein the indicator (72) and the dynamic image representation (76) concurrently communicate the selectively adjusting by the user. The control system as defined in claim 1 wherein the user interface (22) comprises a selective default setting for the spectrum and the image representation.

Inventors: DORSEY JONATHAN A, HRABER RICHARD M, MARTIN ANDREW T, MATTHEWS DAVID S, SPERLING RICHARD A, WHITING JOHN F, DORSEY, JONATHAN A., HRABER, RICHARD M., MARTIN, ANDREW T., MATTHEWS, DAVID S., SPERLING, RICHARD A., WHITING, JOHN F.
Applicants: XEROX CORP, XEROX CORPORATION
Application year: 2000
Main classification: G03G15
IPC codes: B41J5, G03G15, G03G21, G06F3, H04N1