Abstract: A color processing apparatus converts a target M-dimensional color signal in an input color space into an N-dimensional output color signal in an output color space. M and N are natural numbers and N>M. The apparatus includes a first calculation unit and a second calculation unit. The first calculation unit uniquely calculates (N?M) colorants of the converted output color signal from the target color signal with using plural color-signal pairs. In each pair, corresponding one of the (N?M) colorants of an output color signal in the output color space are associated with an input color signal in the input color space. The second calculation unit calculates the M colorants of the converted output color signal from the target color signal and the (N?M) colorants of the converted output color signal.

Abstract: Techniques for modifying aspects of the gamut mapping function in a multi-primary display system influence the performance of the display or the perception of certain ones of the colors. One embodiment of the system comprises a method for selecting a metamer. Other embodiments provide methods for modifying the output color produced by the gamut mapping operation for input colors that are on the darker or brighter surfaces of the input color gamut, or for certain out-of-gamut colors such as yellow colors.

Abstract: Improved methods are provided for calibrating color on a color display coupled to a computer, which are useful for obtaining calibrated data in a virtual proof network for enabling different color devices to render consistent color. Methods involve user interactions with screens on the display to set color display parameters. An apparatus is also provided for calibrating a sensor which may be used for measuring color of a display in one or more of these methods.

Abstract: A color correction apparatus includes a correction unit to correct a color of an input pixel having a color included in a specified region of a color space, a correction range selector to select a range with a center in a grayscale to the specified region. With this color correction apparatus, a grayscale can be specified as the target color and only a part of a region in white component direction can be set as the correction range. Thus a desired range of the grayscale can be corrected.

Abstract: A display (36) for reproducing an image intended for printing on a substrate using a set of inks, the image having a perceived color gamut when print it on the substrate, the display (36) including a light source (38) generating a set of at least three primary color (RGB), and a controller (42) combining the set of at least three primary color to substantially reproduce the image, wherein the at least three primary color define a viewed color gamut which substantially covers the perceived color gamut.

Abstract: Techniques for low cost gamma mapping convert three-primary input image data, such as RGB data, into a four primary color display color space, such as an RGBW color space, for rendering on the display by calculating a value for W image data based upon the RGB image input data; deriving an allowable value for W based upon a chromaticity specification of the display, and calculating output values for R, G and B image data based upon the allowable W value. A display system receiving input image data specified in three input primary colors includes modules for converting the input image data into image data specifying color values in four display primary colors. A first module determines a value of a first display primary color, and a second module determines the value of second, third and fourth display primary colors by computing a solution set to simultaneous equations based upon the value of the first display primary color.

Abstract: A method, for controlling color output of a variable color lighting system (1) capable of emitting light within a color gamut, comprising the steps of receiving (10) a request for a target color (T), converting the target color (T) to a set of lighting system control parameters, and applying (15) the set of lighting system control parameters, thereby controlling the color output of the lighting system (1).

Abstract: White balancing is performed using a mapping that maps the visible gamut's boundary into itself. A predefined color Win is mapped into a color Wout which is a white color or a color perceived as white under some viewing conditions. If Sin is some other color, a corresponding color Pin is determined on the visible gamut's boundary. Pin can be on the intersection of the visible gamut's boundary with a plane containing Sin and Win in a linear color coordinate system. Sin is mapped into a color Sout obtained from Wout and a value of the mapping on Pin.

Abstract: A document edit device includes: a memory configured to store a plurality of data sets, each of which includes identifiers of at least two colors; a color information obtaining unit configured to obtain color information indicating at least one reference color as a color of an element among elements included in a document as an edit target; an extraction unit configured to extract a data set including an identifier of an approximate color, from among the data sets stored in the memory, the approximate color being a color having the shortest color distance to the at least one reference color indicated by the color information obtained by the color information obtaining unit; and a first color determination unit configured to determine a color of an other element included in the document, based on at least one of a color difference vector between two colors included in the data set extracted by the extraction unit and a color difference vector between the approximate color and the reference color.

Abstract: An image processing device outputs four-color image data to a display section, the display section performing display using display pixels each composed of four sub-pixels, and having an arrangement of the display pixels in which a pixel arrangement in an even line of a scan lines and a pixel arrangement in an odd line of the scan lines are shifted a half pitch of the display pixels from each other, and the image processing device includes a color conversion section which obtains three-color image data and converts the three-color image data into first four-color image data while maintaining the number of display pixels in the three-color image data, a conversion section which generates second four-color image data by performing an interpolation process on the first four-color image data based on a relationship between a position of a sub-pixel in the first four-color image data and a position of a sub-pixel in the display section, and an output section which outputs the second four-color image data to the di

Abstract: A method for color grading within a component color space associated with a display includes receiving a source image comprising a plurality of pixels, wherein each pixel is associated with a color comprising a plurality of color component values in the component color space, wherein the component color space comprises RGB, and wherein a pixel is associated with a color inside a gamut of the display but outside a gamut of a target media, receiving a color grading signal from a user, modifying the color associated with the pixel from the plurality of pixels in response to the color grading signal, to form a graded image comprising the pixel, wherein the pixel is associated with a graded color comprising a plurality of color component values, displaying the graded image on the display to the user, automatically performing a gamut remapping of the graded color associated with the pixel, to form a gamut remapped image comprising the pixel, wherein the pixel is associated with a gamut remapped color comprising a p

Abstract: According to one embodiment, a first extraction unit extracts a first group of pixels having a specific hue from an input image. A second extraction unit extracts a second group of pixels having large distance from a reference axis on a plane defined by a chroma axis and a luminance axis from the first group. A first transform unit executes a plurality of color-transform processing to the second group and obtains a plurality of third groups of pixels as the second group transformed by each color-transform processing. A reliability calculation unit calculates a reliability of each third group. The reliability is larger when pixels of the third group are more located in shape of a straight line on the plane. A selection unit selects a color-transform processing by which the third group has the largest reliability from the plurality of color-transform processing. A second transform unit executes the color-transform processing to the input image to obtain an output image.

Abstract: Techniques are described that can be used to provide color space conversion for images and video to a display color gamut space. Some techniques provide for accessing an sRGB gamut color table, determining a color conversion matrix based on the sRGB gamut color table and chromaticity values of RGBW primary and gamma stored in the display or associated with the display, applying color space conversion to the pixels for pixels using the color conversion matrix, and applying linear correction of pixels by applying a normalization factor to the color conversion matrix. In addition, some techniques provide analysis of content gamut with respect to display gamut in HSV space, adjustment in HSV space, and conversion back to RGB space before applying color space conversion.

Abstract: In a method of processing data of a display apparatus, red, green and blue data are gamut mapped as red, green, blue and white data. The red, green, blue and white data are reconstructed by means of subpixel rendering to generate metameric sets dot pixels composed for example of one such dot pixel having red and green color components and another such dot pixel having blue and white color components such that when the metameric set dot pixels is lit up it produces a white colored region on the display apparatus and when un-lit it appears as contrastingly dark colored region on the display apparatus. By selectively forcing one metameric set of dot pixels to be un-lit, the method allows an immediately adjacent metameric set of dot pixels to be lit-up as a contrasting white region on the display apparatus.

Abstract: Determining a spectral gamut of a device by designating a spanning set of samples which span the spectral gamut. A first crude spanning set of samples is established by specifying one or more corresponding device values in a device color space. The first crude spanning set is refined by processing a plurality of new samples in a predetermined order. The processing includes, for each new sample, determining if the new sample differs in an objective function value by more than a predetermined threshold from all samples in the first crude spanning set and adding the new sample to the first crude spanning set if the new sample differs in the objective function value by more than the predetermined threshold. The resulting first crude spanning set is designated as the spanning set of samples.

Abstract: A method and system are provided for image display with color transformations that also compensate for non-uniformities in different regions of a display. The method involves performing color measurements at different locations or zones of a display, and deriving respective compensation factors based on these measurements and corresponding target color values, such as those associated with a reference display. These zone- or location-specific compensation factors can be used to derive appropriate compensation factors for arbitrary pixels in an image, which are then used for color transformation of the pixels for display.

Abstract: An image processing method is used to converting a color within a first color reproduction range that is a device-independent color space into a color within a second color reproduction range that is a color reproduction range of an output device. The image processing method includes defining, within the first color reproduction range, a third color reproduction range of a color that is estimated to be input; defining, within the second color reproduction range, a fourth color reproduction range that is smaller than the second color reproduction range; and, in performing the color conversion, compressing a color within the third color reproduction range into a color within the fourth color reproduction range and compressing a color within the first color reproduction range and outside the third color reproduction range into a color within the second color reproduction range and outside the fourth color reproduction range.

Abstract: A method and apparatus for performing color plane adjustment are provided. In one embodiment, an apparatus comprises a set of inputs for receiving a first input value and a second input value in a color space. The apparatus also comprises a color plane adjustment component operative to adjust the first input value and the second input value by amounts that depend on a distance of the first input value and second input value, respectively, from a value of neutral gray in the color space. The apparatus further comprises a set of outputs for outputting the adjusted first and second values. A related method and computer program are disclosed. Other embodiments are disclosed, and each of the embodiments can be used alone or together in combination.

Abstract: The invention provides a Gamma conversion system applied on a source of image pixel data. Each image pixel data in the source of image pixel data has an M-bit pixel value with a first Gamma exponent. The Gamma conversion system comprises a storage module, a processing module, and a selecting module. The storage module therein stores I look-up tables. The processing module is respectively coupled to the source of image pixel data and the storage module, and the processing module comprises I converting modules, each of the converting modules corresponds to one look-up table. The selecting module is coupled to the source of image pixel data and the processing module respectively, and generates a selection signal according to the M-bit pixel value. In response to the selection signal, the processing module assigns one of the converting modules to convert the M-bit pixel value into an N-bit pixel value with a second Gamma exponent according to the look-up table corresponding to the assigned converting module.

Abstract: Elements of the present invention relate to systems and methods for determining device white point and gamma correction curve characteristics.

Abstract: In a first embodiment, a display system comprises a display panel with 4 or more colored subpixels. The display system receives input image data specified in a first color space and outputs image data specified in a second color space. The display system further comprises a gamut mapping module for mapping the input image data specified in the first color space to image data specified in the second color space. The gamut mapping module clamps out-of-gamut colors using at least a first clamping system and a second clamping system. The first and second clamping systems yield first and second clamped values. A weighting module produces a resulting clamped value from the first and second clamped values. A final output image value is derived from the resulting clamped value. Other embodiments of the display system include pre-reduction modules and adjustable GMA modules.

Abstract: Embodiments of the present invention comprise systems, methods and devices for adjusting image code values in conjunction with display light source illumination levels for enhanced image display.

Abstract: A method of generating a display from a plurality of color image display sources such as a projector or a video monitor. The non-linear color response is first determined for each projector/monitor by using a color camera or other sensor to capture a displayed image. Each of the display sources is then linearized using the inverse of the respective non-linear color response. A common reachable gamut is derived in an observed color space for each of the sources. A transform is determined that maps an observed gamut to a target device-specific color space for each of the display sources. The respective transform is then applied to color values input to each of the display sources to make more similar the observed color response of each of the displays.

Abstract: An improved gamut map model (GMM) useful in conjunction with Windows Color System (WCS). The method uses the WCS Minimum Color Difference (MinCD) GMM to handle gamut mapping for the Saturation rendering intent at low input chroma values. For input values to the gamut map model profile (GMMP), if the chroma value C falls within a predetermined chroma value range, the MinCD GMM will be applied, otherwise the Hue Mapping GMM is applied. The predetermined chroma value range can be determined by experimentation. The range is 0?C?10 in a preferred embodiment. This method will improve the gradation fidelity of the rendered images and reduce or prevent major hue shifts at low chroma values. The method may be implemented as a plug-in utility for a computer.

Abstract: System and method for maintaining perceived hue constancy. A method for displaying an image includes receiving a color vector and associated image data, remapping the color vector to maintain a perceived hue constancy by adjusting a hue component of the color vector in response to a change in a lightness component or a chroma component of the color vector, providing the remapped color vector to a light source for display, and displaying image data associated with the color vector. The use of the constant hue curve ensures that the adjusting of the color vector maintains the perceived hue of the color vector, thereby helping to maintain image quality.

Abstract: A display control apparatus displays image data expressed under a plurality of different color spaces. A discriminating section discriminates color space information on image data to be displayed. A gain switching section switches between gains in accordance with a result of the discrimination and sets a gain adapted for the image data to be displayed. An amplifying section amplifies an image signal, generated based on the image data and relating to at least a color difference, in accordance with the gain set by the gain switching section.

Abstract: A system for expanding color gamut includes: a signal input unit configured to input color information of pixels; a forward transform unit configured to transform the color information of pixels to L, a and b values in a linear Lab color space; a color gamut expansion unit configured to receive a color gamut expansion coefficient, expands L, a and b values provided by the forward transform unit to new L, a and b values in the linear Lab color space according to the color gamut expansion coefficients; a reverse transform unit configured to transform the expanded L, a and b values to color information of pixels in a large color gamut; and a signal output unit configured to output the color information of pixels in the large color gamut. A corresponding method for expanding color gamut is provided.

Abstract: Various embodiments are directed to gaming devices utilizing a color reduction filter. In one embodiment, the color reduction filter reduces the number of unique colors in a digital image presented on a gaming device from N to M where N>M. The color reduction filter maintains the color palette and clarity of the image with fewer colors while enhancing the effectiveness of file compression. As a result, the processing unit of the gaming device has more time to run various applications and has more available memory for computational processes.

Abstract: The invention is directed at least in part to a method of illuminating an imager for projecting images, implementing light-emitting diodes of different colors, the diodes being designed to provide a beam illuminating the imager. According to various embodiments of the invention, for a set of at least one imager, the method includes receiving each image of the set; determining a color base dependent on the set of at least one image, called a secondary color base; and dynamically controlling the diodes according to the secondary color base. The invention also relates to a system implementing the method and a projector comprising such a system.

Abstract: A facility for adapting a subject color to be compatible with a basis color is described. The facility accesses a color transformation specification that specifies how the subject color is to be adapted to be compatible with the basis color. The facility then applies the accessed color transformation specification to the subject color to adapt the subject color to be compatible with the basis color.

Abstract: A laser image display device includes: a first laser light source capable of outputting a laser light having a first wavelength; a second laser light source capable of outputting a laser light having a second wavelength; and a color output conversion controller capable of individually controlling power of the first and the second laser light source displaying the pixels constituting an image according to an input signal.

Abstract: A signal processing apparatus (200) is provided with a color coordinate adjusting unit (210) which performs color coordinate adjusting processing according to the color space of a display device, a luminance adjusting unit(220) which performs luminance adjusting processing, a display element control unit (240) which generates an image output signal on the basis of the color coordinates adjusted by the color coordinate adjusting processing and luminance components adjusted by the luminance adjusting processing, and a ratio control unit (230) which controls according to the saturation of an image input signal the degree of contribution of color coordinate adjustment which is provided by the color coordinate adjusting processing to the image output signal and the degree of contribution of the luminance components which is provided by the luminance adjusting processing to the image output signal.

Abstract: A display device is provided that includes a plurality of pixels, where each pixel includes a single subpixel. In a first aspect, a single subpixel is able to sequentially generate a plurality of (e.g., at least three) primary colors. As a result of the single subpixel, the display is able to supply a gamut of colors including at least 3 primaries colors. For example, the sequential generation of the 3 primary colors may involve operating the subpixel in a time division multiplex (TDM) mode, and a primary combination color is supplied in response to the subpixel generating 2 primary colors in respective TDM subframes. When the pixel includes at least two neighboring subpixels, the pixel may additionally be operated in a spatial division multiple (SDM) mode or in the TDM mode.

Abstract: The present invention introduces an intuitive system for digital processing. The system of the present invention allows a user to enhance digital images that appear dark or dull. In one embodiment, the user activates an image enhancement button on a graphical user interface using cursor control device such as a mouse button. In one embodiment, the digital image enhancement system is implemented using a nonlinear brightness level transformation correction and a pseudo gamma correction. The parameters for both the nonlinear brightness level transformation correction and a pseudo gamma correction are determined from examining the properties of the image to be enhanced.

Abstract: A mapping technique is disclosed that maps color image data of an image displayed on a first image display device to output color image data for display on a second image display device. This mapping technique maps the color gamut of the first image display device to the color gamut of the second image display device while controlling one or more characteristics of the color image data, and generates one or more lookup tables that correspond to the gamut mapping, for example. The color image data is then mapped to the output color image data based on the lookup tables.

Abstract: A test apparatus comprising a combination of front illuminated and rear illuminated optical reference test elements designed to produce predetermined electronic signals. The front illuminated elements comprise spectrophotometrically neutral gray patches and primary and secondary color patches of predetermined hues. Additional color patches having the same hue as the primaries and secondaries, but at lower saturation levels, generate unique logical patterns on display devices well known to the broadcasting and image reproducing industries. The rear illuminated test elements comprise wide color gamut hues at levels of saturation not attainable in reflected light systems. Also disclosed is a method of evaluating and optimizing the image quality in high gamut imaging systems, using the above described apparatus.

Abstract: The color remapping system places axes on the Cb-Cr color plane to differentiate and isolate colors of interest. Each axis has a programmable position, hue change value and saturation change value. Input pixels from the video data stream are calibrated with respect to the axes and enhanced based upon the two neighboring axes adjacent to the input pixels. The system can be reconfigured in real time by repositioning the axes and changing their hue and saturation change values. The system is easy to program and reconfigure and provides visually pleasing enhancements to the digital video.

Abstract: In an image update, a display apparatus receives only a new portion (1110) of an image for display but does not receive the remaining, unchanged portion of the image. The display apparatus performs a subpixel rendering (SPR) operation (454) for the new portion but does not redo the SPR for the whole image. Efficient techniques are provided to achieve good appearance at the edges between the new portion and the rest of the image. Other features are also provided.

Abstract: Disclosed embodiments relate to techniques for color gamut mapping when an input signal transmitting color visual images has a different color gamut than does the output display device. Polynomial rubber-sheet mapping may be used to translate the input color gamut to the output color gamut on a hue-by-hue basis within a three-dimensional perceptual color space. Also, a memory color look-up table may be used to preserve memory colors in the input gamut which are capable of reproduction within the output gamut. By using such techniques alone or in combination, it may be possible to more effectively map an input color gamut to a different output color gamut with improved calorimetric accuracy.

Abstract: A color temperature calibration method for calibrating the color temperature of a display device according to a set of target chromaticity coordinate values, includes: measuring colors displayed by a plurality of display cells of the display device to generate at least a set of measurement chromaticity coordinate values; and adjusting at least a first gain value of the display device according to the set of target chromaticity coordinate values and the set of measurement chromaticity coordinate values; where the first gain value corresponds to the color of a first color channel of the display device; and the first color channel is one of the red color channel, green color channel and blue color channel.

Abstract: Spectral gamut mapping is performed for reproducing an image comprising a plurality of pixels using a device. Sample data is generated to span a spectral gamut of the device, the sample data is divided into plural subdivisions based on colorimetry of the sample data, a local interim connection space (ICS) is constructed for each of the plural subdivisions, and a sub-gamut is constructed corresponding to each of the local ICS's. For each of the plurality of pixels, a sub-gamut which corresponds to the pixel is selected from the constructed sub-gamuts, and spectral gamut mapping is performed for the pixel using the selected sub-gamut in the local ICS.

Abstract: There is provided a method of changing a theme for a user interface of a computer system comprising receiving an identification of an image with which to define a color palette of a theme for rendering elements of a user interface on a color display of the computer system; analyzing the image to determine at least one predominant color; and defining the color palette in response to the analysis. The image may comprise a background image selected by a user for display by the computer system. Dynamic generation of the color palette matches the user interface to colors to provide flexible and appealing themes. A computer readable memory having recorded thereon instructions to carry out this method is also provided, as well as a device comprising such memory.

Abstract: Methods and systems in an image processing device for controlling colors that are located external to a gamut are disclosed. A plurality of color values can be automatically provided as input to said image processing device, wherein said image processing device is under a control of a particular dimensional order, typically a three-dimensional order, but alternatively can be a two-dimensional order. Next, an operation can be performed dynamically determining which color value among the plurality of color values has attained a gamut limit. Thereafter, the particular dimensional order can be automatically reduced, thereby providing improved control for colors that are located external to said gamut. The plurality of color values analyzed is generally associated with three colors—cyan, magenta, and yellow.

Abstract: A system that converts color coefficients between color spaces. During operation, the system receives a color profile comprising a lookup table which defines a conversion of color coefficients between a source color space and a destination color space, wherein the source color space includes a black color channel. Next, the system identifies a darkest output color value in the destination color space produced by the color profile, and also identifies entries in the lookup table corresponding to a maximum possible value for the black color channel of the source color space. The system then updates the identified entries with an achromatic equivalent of the identified darkest output color value, whereby source colors having the maximum possible value for the black color channel are mapped to the achromatic equivalent of the identified darkest output color value.

Abstract: A method of correcting a preferred color is disclosed. The method includes converting an input image including multi-primary color data of three or more primary colors into an XYZ color space, converting the XYZ color space into data of an LCH color space, expanding a color gamut of the data in the LCH color space to detect a preferred color region of the color gamut expansion data, correcting data of the preferred color region using parameters independent of the input image, inversely converting the corrected data of the preferred color region of the color gamut expansion data into an XYZ color space, dividing the XYZ color space into multi-primary color data of four or more primary colors, and displaying the multi-primary color data on a display device.

Abstract: Several embodiments of the present application disclose techniques, systems and methods for changing or rendering input image data that may assume a first white point for a given display into image data to be rendered under a second—assumed, desired or measured—white point of the display.

Abstract: An image processing device including an input section, an image storage section, a storage area reserving section, a controller, and an output section is provided. The storage area reserving section reserves, when description data input via the input section indicates that a partial image including a transmission image is to be stored, a partial image area and an entire image area at the image storage section. The color space converter performs conversion using a first output color space conversion function that converts a description color space of the description data into an output color space that includes an entire image plane and a partial image plane. The controller converts the color-space converted partial image into an output image format and writes it in the partial image area, and converts the color-space converted entire image into an output image format and writes it in the entire image area.

Abstract: Color management which uses a color conversion LUT for transformation from an N-dimensional source device color space (N?4) to a destination device color space, in which the color conversion LUT is constructed in a two-step process. In the first step, an intermediate color conversion LUT is constructed that converts colors in a three-dimensional device-independent color space through a gamut mapping step and through an inverse destination device transform so as to obtain colors in the destination device color space. In the second step, the overall color conversion LUT is obtained by applying a source device transform to color combinations in the source device color space so as to obtain color values in the three-dimensional device-independent color space, and thereafter performing three-dimensional color look-ups in the intermediate color conversion table.

Abstract: Reference image data from a reference display is utilized to manually and/or automatically calibrate a display. The reference image data is compared to measured image data from the display to derive display control settings and feedback for users and/or to automatically adjust the display. In one instance, a graphical user interface is used to relay feedback information as a user manually adjusts a display. The feedback can include suggestions for adjusting existing controls (e.g., brightness, contrast, etc.) so that a user does not have to directly interpret gamut and/or gamma information. In other instances, the feedback information is utilized to automatically adjust the display without user involvement.

Abstract: A method for color calibration is provided. The method includes the steps of: providing an input color; obtaining luminance of the input color; determining a grey level of the input color according to luminance of the input color; determining a first calibration matrix and a second calibration matrix according to the grey level of the input color; generating a third calibration matrix according to the first calibration matrix, the second calibration matrix and the grey level of the input color; generating an output color according to the third calibration matrix and the input color.