Abstract: A backlight unit usable in an LCD for dynamically expanding color gamut of the LCD. In one embodiment, the backlight unit has a plurality of light emitting elements, and a control unit electrically coupled with the plurality of light emitting elements for controlling intensity of light emitting from each of the plurality of light emitting elements in response to a frame of image data applied to the plurality of pixels, wherein the control unit is configured such that when the frame of image data applied to the plurality of pixels is in a red color, a green color, or a blue color, the intensity of light from the red color, the green color, or the blue color emitting from each of the plurality of light emitting elements is adjusted to its corresponding maximal value so as to expand the red, the green, or the blue area of the color gamut of the LCD panel accordingly.

Abstract: A system and method for conserving memory bandwidth while supporting multiple sprites includes a memory device that stores main display data and the multiple sprites for presentation upon a display device. A display controller populates a fetch table with pixel source identifiers that indicate pixel sources from either the main display data or one of the multiple sprites. The pixel source identifiers correspond to display pixels of the display device. The display controller then utilizes the pixel source identifiers to directly locate the appropriate display pixels from the various pixel sources for providing to the display device.

Abstract: In gamut mapping, as the brightness of the original color (S) increases further and further beyond the source gamut (110) boundary, the corresponding color (S?) in the target gamut (120) becomes closer and closer to a white color (W). Image distortion is reduced as a result.

Abstract: A method and apparatus is used for gamut mapping to a printer gamut that includes receiving a narrow gamut, a wide gamut, a printer gamut for printing on a printer and a predetermined mapping between the narrow and printer gamuts, identifying overlapping areas in the wide gamut, the narrow and printer gamuts, determining when the narrow gamut overlaps areas of the wide gamut, utilizing the narrow gamut values when the determination provides overlapping areas of the narrow gamut and the wide gamuts, selecting a wide gamut interpolation point corresponding to the surface of the printer gamut when narrow gamut areas do not overlap the wide gamut according to the determination, selecting a narrow gamut interpolation point by mapping the narrow gamut to the printer gamut and interpolating the narrow gamut interpolation point and the wide gamut interpolation point expanding the narrow gamut values into the printer gamut.

Abstract: In order to implement color matching between different printers upon proofing or the like, color processing that absorbs not only a difference between gamuts but also differences among white, black, and a gray line is provided. Two pieces of gamut information of an appearance color space of first and second image devices are acquired. The color signals on a gray line of each gamut information are converted into those on a lightness axis of the appearance color space. A gamut indicated by the gamut information of the first image device is mapped within a gamut indicated by the gamut information of the second image device. Color signals after mapping, which correspond to a gray line of the first image device, are converted into gray color signals according to white and black indicated by the gamut information of the second image device.

Abstract: A color gamut component analysis apparatus includes: a histogram processing section that performs histogram processing on color components in a video signal; a color gamut component calculating section that calculates a wide color gamut component larger than a signal by a predetermined standard, from the result of the histogram processing by said histogram processing unit; and a graphic processing section that generates and outputs a user interface image which shows the presence of said wide color gamut component in said video signal, or the ratio of said wide color gamut component to said video signal.

Abstract: Image acquisition refers to the taking of digital images of multiple views of the object of interest. In the processing step, the constituent images collected in the image acquisition step are selected and further processed to form a multimedia sequence which allows for the interactive view of the object. Furthermore, during the Processing phase, the entire multimedia sequence is compressed and digitally signed to authorize it viewing. In the Storage and Caching Step, the resulting multimedia sequence is sent to a storage servers. In the Transmission and viewing step, a Viewer (individual) may request a particular multi-media sequence, for example, by selecting a particular hyperlink within a browser, which initiates the downloading, checking of authorization to view, decompression and interactive rendering of the multi-media sequence on the end-users terminal, which could be any one of a variety of devices, including a desktop PC, or a hand-held device.

Abstract: Methods and apparatuses for performing color manipulation using virtual gamuts. In one aspect of the invention, a method to perform color manipulation on a digital processing system includes: performing color manipulation using a virtual gamut of a device if a real gamut of the device is poor quality. When the real gamut of the device is wide, color manipulations are performed using the real gamut of the device. In one example according the this aspect, whether or not the real gamut of the device is poor in quality is determined by comparing an area of the real gamut with a threshold gamut area in a chromaticity diagram. A virtual profile of the device specifies the virtual gamut of the device.

Abstract: To obtain suitable reproduction of an image reproduced on an input system on an output system, when a color signal A acquired from an image processing device is contained in a low-saturation area on the color space containing a color signal P of gray for an image output device at a lightness of the color signal A and a color signal O of calorimetrically achromatic color, the color signal A is converted in accordance with a conversion function that converts the color signal on a line segment BP, which connects a color signal B that is the intersection of a line segment AP connecting the color signal A and the color signal P and the outermost contour of the low-saturation area, and the color signal P into a color signal on a line segment BO connecting the color signal B and the color signal O. On the other hand, when the color signal A is not contained in the low-saturation area, the color signal is not converted.

Abstract: A color signal correction apparatus, for suppressing variation of a chromaticity point of achromatic color in a display apparatus, equipped with independent luminescent characteristic correction units respectively for each color for correcting a luminescent characteristic of luminance of respective RGB colors, an offset value for use in chromaticity correction, for suppressing variation of a chromaticity point of a simple color and a white color, which is defined in accordance with a luminance level is selected or generated based on one or two color data selected from respective RGB colors inputted into the correction unit, and the value is added to one color data selected from remaining one or two colors, and inputted into that color's correction unit, and thereby, it becomes possible to produce a color signal for suppressing variation of the chromaticity point, and to suppress variation of a chromaticity point of a simple color and an achromatic color.

Abstract: Some embodiments provide an intuitive system for digital image processing. In some embodiments, the system of the present invention allows a user to enhance digital images that appear dark or dull. In some embodiments, the user activates an image enhancement button on a graphical user interface using cursor control device such as a mouse button. In some embodiments, the digital image enhancement system is implemented using a nonlinear brightness level transformation correction and a pseudo gamma correction.

Abstract: In order to obtain an excellent color processing result by calculating an optimal white point in partial adaptation, first white point data which indicates white of a device is input, the first white point data is projected onto a predetermined curve, and white point data in the partial adaptation located on the predetermined curve is calculated using the projected first white point data and the second white point data located on the predetermined curve. Color processing of input color data is performed using the white point data in the partial adaptation, which is corrected in accordance with the positional relationship between the first white point data and projected first white point data, and the color reproduction characteristics of the device.

Abstract: Color management for extending a received color gamut for display. The received color gamut is expanded by applying a gain to color components. The applied gain varies depending on the saturation of the color component. Highly saturated colors in the received color gamut may accordingly be modified to a larger extent than less saturated colors to increase the vividness of highly saturated colors to the edges of the display's color gamut, while less saturated colors, such as memory colors, receive less gain and therefore are maintained as the same or similar to their original color.

Abstract: A method of and apparatus for displaying an image having a wide color gamut are provided. The method includes: receiving a first image of a first color gamut; generating an intermediate image by reducing pixel values of the first image; converting the intermediate image into a second image of a second color gamut; displaying the second image on a display apparatus; and adjusting a brightness of the display apparatus.

Abstract: A method and system for converting color image data (data outputting from element 202) from a, for example, three-dimensional color space format to a format usable by an n-primary display (206), wherein n is greater than or equal to 3. The system (converter 204) may define a two-dimensional sub-space having a plurality of two-dimensional positions, each position representing a set of n primary color values and a third, scaleable coordinate value for generating an n-primary display input signal (signal inputting toi display 206). Furthermore, the system may receive a three-dimensional color space input signal including out-of range pixel data not reproducible by a three-primary additive display, and may convert the data to side gamut color image pixel data suitable for driving the wide gamut color display.

Abstract: The electronic camera has an imaging device that images a subject with subject reflectance R (%) with a dynamic range wider than that at displaying or printing to acquire image data and a recording device that converts the image data acquired by the imaging device with a predetermined function and records the converted image data and the information on the function as digital values (digit). Therefore, a printed image with an automatically or manually corrected density can be obtained at the displaying or the printing.

Abstract: A color compensation method for a display device. A brightness eigenvalue and color gamut eigenvalue of the display device is determined. A plurality of signals of three major colors are applied into the display device to display a plurality of colors. The colors are measured to get a plurality of chromaticity eigenvalues. The brightness eigenvalue, the color gamut eigenvalue and the signals of the three major colors are applied into a formula to establish a color database. A target chromaticity eigenvalue and a data eigenvalue in the color database are applied into another formula to calculate a compensated signal eigenvalue to compensate color difference of the display device.

Abstract: An improvement to sigmoidal gaussian cusp knee (SGCK) gamut mapping algorithm useful for gamut boundary descriptors (GBDs) that are defined with multiple shells rather than a single hull. The gamut mapping algorithm involves a lightness-rescaling step and a chroma compression step, in which points on each of the shells of the source GBD are mapped to corresponding points on the respective shells of the destination GBD. In situations where there is a mismatch between the number of shells in the source GBD and the destination GBD, such as a case where one of the GBDs is defined by a singly-shelled GBD whereas the other is defined by a two-shelled GBD, an induced hue slice may be constructed so as to simulate the missing shell. In addition, an induced hue slice may be constructed in a situation where lightness rescaling results in a mapping that is too steep between source and destination.

Abstract: Systems and methods are disclosed of a smooth gray component replacement strategy which utilizes the full gamut of a printer device. A CMY to CMYK gray component replacement transform is disclosed which inherently exploits the full gamut of the printer, by transforming points in CMY cube to L*a*b* color space, scaling the obtained values so they fill the maximum gamut obtainable with the printer device and calculating the CMYK values needed to obtain the scaled L*a*b* values. The CMY to CMYK transform is then smoothed with an averaging filter that does not change CMYK values at the corners. The entire color gamut is adequately sampled and small changes in CMY do not produce large jumps in L*a*b*.

Abstract: A method for displaying a color image by providing a color image display apparatus having at least three narrow-band emissive light sources that define a display color gamut. Image data values are accepted that are defined within an original color gamut that is smaller in area than the display color gamut. The input image data values are transformed into display color gamut data values having an expanded image chromaticity range. At least a portion of the expanded chromaticity range lies outside the original color gamut. At least a portion of the display color gamut lies outside the expanded image chromaticity range. The display color gamut data values are provided to the color image display apparatus to form an image.

Abstract: An apparatus and method automatically adjusting the brightness and the color temperature of a screen to an optimum state according to input RGB signals. The apparatus includes an RGB color signal generator and a system controller. The RGB color signal generator determines a maximum value of each of the input RGB color signals and a total maximum value, compares the total maximum value with a predetermined critical value, adjusts the brightness level of the input RGB color signals based on the comparison result, compares the maximum values, and if one of the maximum values is higher than the others, generates RGB color signals, one of which has a color temperature varying according to a predetermined value. The system controller provides the RGB color signal generator with data on the predetermined critical value and a reference value used for detecting the color signal having the higher maximum value.

Abstract: An apparatus for monitoring a video signal comprises means for detecting a gamut error in an R component, means for detecting a gamut error in a G component, and means for detecting a gamut error in a B component. The means for detecting a gamut error in the R component includes: means for generating a first condition Y>S?a×Pr (where a is a predetermined coefficient) and a second condition Y<T?a×Pr from a Pr component of a Y/color difference component signal and an upper limit value S and a lower limit value T of the RGB component signal. The apparatus further comprises means for making a gamut error state visually recognizable with respect to the R component when the first condition or the second condition is satisfied.

Abstract: Disclosed are embodiments of a system and method for rendering colors between color devices. The method includes establishing a source color gamut for a source device and the source color gamut has a white point, a black point, and primary points. The method also includes establishing a destination color gamut for a destination device, and the destination color gamut has a white point, a black point, and primary points. White and black point adaptation is performed to adapt the white and black points of the source color gamut to the white and black points of the destination color gamut, respectively. Neutral points from the source color gamut are processed to the destination color gamut without gamut mapping. Aimed primary points are determined from the adapted white and black points and from the source and destination primary points, the destination gamut, and color preference. Important lines are mapped from the source gamut to the destination gamut using the aimed primary points.

Abstract: A video node for use in rendering one or more video frames of a video stream. The video node is represented by a compositing tree (2100). The compositing tree (2100) comprises at least one image primitive node (2140) representing one or more video frames (2300) of the video stream. At least one of the video frames (2300) represented by the image primitive node (2140) is composited with at least one further graphical primitive represented by at least one further primitive node (2130) of the compositing tree (2100). The video frame (2300) is composited with the further graphical primitive according to a compositing operation represented by an operation node of the compositing tree (2100) in order to generate a composite image (2303) represented by at least one composite node (2150) of the compositing tree (2100).

Abstract: The present invention provides a display device which can suppress the increase of a chip size while reducing the number of transistors of a decoder circuit compared to the prior art. Assuming m (m being an integer of 2 or more) as a lower-order bit in accordance with n-bit display data, a drive part includes a gray-scale voltage generating circuit which generates M pieces of gray-scale voltages where the gray scale number with respect to the gray-scale voltages is discontinuous, a decoder circuit which selects two neighboring gray-scale voltages out of M pieces of gray-scale voltages based on data of upper-order (n-m) bits in accordance with n-bit display data, and an output amplifying circuit which generates gray-scale voltages between two gray-scale voltages from two gray-scale voltages selected by the decoder circuit based on the data of lower-order m bits in accordance with n-bit display data and outputs the gray-scale voltages to the video lines.

Abstract: A method of producing a display image comprises receiving image information representing an image to be displayed, producing an image formed of a plurality of images of different colors, and projecting the produced image along an optical path. The differently colored images have color intensities related to energy applied to a light source. A level of energy is applied to the light source during production of the image of one color that is different than the level of energy applied to the light source during production of the image of another color.

Abstract: System and method for dynamically altering a color gamut used in projection display systems. An embodiment comprises determining a dim color from colors used in representing an image, adjusting the dim color to increase an available display time for a non-dim color used to represent the image, adjusting the non-dim color using the available display time, and generating a color sequence based on the adjusted dim color and the adjusted non-dim color. The pixel intensities of a dim color are increased, permitting a shortening of the display time of the dim color. The newly freed display time can be reallocated to all colors to increase the amount of light used to display the image, thereby increasing image brightness or altering color point.

Abstract: Provided is an apparatus and method for displaying a picture in a portable terminal. The method includes identifying a visibility color quality corresponding to the external brightness upon sensing of generation of a visibility control event, identifying external brightness, identifying a set color quality that is a color quality currently output to a display unit, comparing whether the visibility color quality is equal to the set color quality, and altering the set color quality into the visibility color quality when the comparison result is that the visibility color quality is not equal to the set color quality.

Abstract: The present invention provides for gamut mapping between a source device and a destination device, the destination device having a destination device black point with a hue, and the source device and the destination device being respectively characterized by a source gamut shell and a destination gamut shell. A lightness compression is performed using the source gamut shell, the destination gamut shell and the destination device black point. A constant lightness transformation is performed, wherein the constant lightness transformation modifies the destination gamut shell so that a shell boundary of the destination gamut shell on the hue plane containing the destination device black point is shifted from an original position to align with a neutral axis of the destination gamut shell. A chroma compression is performed using the source gamut shell and the modified destination gamut shell.

Abstract: A document-to-printer color gamut matching system enables comparison of at least two color maps in a manner that allows selection of the printer that will result in the best print output. Information related to the document to be printed and information describing the color gamut(s) that each available printer is capable of printing is compared. Each color gamut is evaluated to determine suitability for use with the document. The document-to-printer gamut matching system may provide the author of the document with a number of candidate printers best matched to the printing of the document depending on the rendering intent of the author; may select a printer based on a measurement of best fit; or may generate a custom color map to result in a color gamut that is satisfactory.

Abstract: A white balance method is disclosed for image processing. Characteristic information of a portion of pixels in a first frame is detected. First pixels are selected when the characteristic information of the first pixels in the first frame meets an optical requirement. An average hue of the selected first pixels is obtained. A hue range the average hue belongs to is determined. Characteristic information of a portion of the pixels in a second frame is detected. Second pixels are selected when the characteristic information of the second pixels in the second frame meets the optical requirement and a pixel hue of the second pixels is within the hue range. A first average red-channel value, a first average green-channel value, and a first average blue-channel value of the selected second pixels are obtained for acquiring a gain of each color component of an image. The gain of each color component of the image is adjusted according to the hue range.

Abstract: To provide an environment-compliant image display system, image processing method, and information storage medium that enable correction of images within a shorter time, a Y value of color signals (Y3, x3, y3) measured by a color light sensor 60 and converted by an Y3x3y3 conversion section 143 is replaced with Y1, which is a Y value of an ideal environment, by a Y replacing section 142; color difference between the replaced color signals (Y1, x3, y3) and ideal color signals (Y1, x1, y1) is obtained by a color difference calculation section 145; and image display information is corrected by using that color difference (?x, ?y).

Abstract: By using a spectral reflectance of a projection plane or color information under a light source, which is stored in wall color storage means 4, matrix calculation means 5 calculates a conversion matrix, and mixing amounts R, G, B of primary colors of an input image are converted into corrected mixing amounts R?, G?, B?, and they are projected by means of a projector. Thereby, even in a case where a wall is colored, correct color reproduction is made in a colorimetric manner.

Abstract: Disclosed are a method of compensating colors in an image display device for users with color vision deficiency and a device of the same, enabling the users with color vision deficiency to view display images as vividly and naturally as normal users. The method for compensating colors in an image display device includes a step of determining whether a user is partially color blind or normal, and a step of controlling gain values of a plurality of color signals depending upon the user's color perceptivity so as to compensate colors displayed on a screen, if the user is determined to be partially color blind.

Abstract: A correction characteristic determining device for (a) converting measured data, indicative of an emission condition of a liquid crystal panel, into brightness data of three primary colors by using a conversion matrix, and (b) determining the correction characteristic in accordance with a conversion result obtained by (a). The device may in certain example embodiments may set a target curve indicative of a relationship between a grey (or gray) scale value of an image signal and target output brightness. An adjustment parameter may be set by subtracting an actual brightness value from a lowest target output brightness in certain example embodiments. A relationship may be determined between a non-corrected grey scale value and a corrected grey scale value in accordance with the target curve that has been adjusted based at least on the adjustment parameter.

Abstract: In a color image forming apparatus in which images of a plurality of element colors are sequentially transferred to form a color image, there are provided a plurality of RAM/register units with respect to one image processing unit. Control information is previously stored in the RAM/register units, so that the switching of the element color to be transferred is achieved by switching the RAM/register units, not by rewriting the contents of the RAM/register unit. Thereby, simplification of constitution and high-speed printing can be achieved.

Abstract: A CPU of a color printer performs gamma correction and a matrix operation M on an RGB color space image data derived by a matrix operation S. Using gamma correction value settings, the CPU performs gamma conversion of image data. Matrix operation M converts the RGB color space to an XYZ color space. When performing matrix operation M, the CPU refers to a PrintMatching tag and performs the matrix operation using a matrix (M) that corresponds to the indicated color space, in order to reflect the color space used for generation of image data.

Abstract: A gamut error false color display uses false coloring on a monochrome image of a video picture being tested. Composite and component gamut error signals are extracted from an input video signal representing the video picture being tested. Such error signals may represent gamut error states corresponding to near out-of-gamut, out-of-gamut high, near out-of-gamut low, out-of-gamut low, etc. A false color display generator has the gamut error signals and a luminance component of the input video signal as inputs and outputs the gamut false color display as the monochrome image with different colors for those pixels in the monochrome image that correspond to the gamut error signals when a gamut error is indicated. Each display component may be tested for gamut errors as well as the video picture as a whole (component or composite). Also either fixed or variable persistence may be used to identify gamut errors over several video pictures in the input video signal.

Abstract: An image display apparatus includes a display unit that arranges and displays display images of a plurality of original images in a plurality of display areas on a display so as to be comparable with each other, an operation input unit that sets a color temperature of the display image independently every display image or interlockingly with respect to the display images on photographing data or information on the color temperature set in the past, and a display-color correcting unit that generates the display image whose color temperature has been corrected on the basis of the setting by the operation input unit, displays the generated display image displayed in the display area on the display via the display unit, and corrects the color temperature of the original image so as to match that of the display image upon the storing operation.

Abstract: A white image is projected on a projection surface with a projector and color information of the white image is captured by a color sensor 11. A color transformation providing color appearance matching is generated based on color space of an input image and color space on the projection surface, and is stored in a memory. The color of the input image is subjected to color correction using the color transformation. After subjected to gamma correction if necessary, the color-corrected image is output to the projector.

Abstract: In various embodiments, methods and systems for brush composition are described. In one particular application of brush composition, opacity issues are addressed by focusing on the composition of objects having opacity effects in terms of the brushes that are used to render the objects. By focusing on the brushes that are used in the rendering process, instead of the individual objects and their particular colors, processing economies and efficiencies can be experienced. Specifically, in some instances, because of the particular way that overlapping objects interact, focusing on the brushes that are used with the individual objects and creatively attempting to combine or compose the brushes for operating on the areas of overlap, some processing steps that might otherwise have been required at the object/color level can be eliminated, thus providing a streamlined and efficient process.

Abstract: A technique for correcting white eye in image data is disclosed. In this technique, a white eye candidate pixel is detected from an eye extracted from the image data based on a predetermined detection condition. The white eye candidate pixel as a white eye pixel based on a predetermined determination condition. Then, white eye correction is effected on the determined white eye pixel by changing its luminance.

Abstract: A method of creating an image is disclosed. The image is formed by rendering at least a plurality of graphical objects to be composited according to a first hierarchical structure (eg. 4500) representing a compositing expression for the image. The first hierarchical structure (4500) includes a plurality of nodes each representing at least a component of the image or an operation for combining sub-expressions of the compositing expression. The method stores a second hierarchical structure (300) for at least one node of the first hierarchical structure (4500). The second hierarchical structure (300) indicates at least an unobscured region of an object associated with the node. A space in which the object is defined is partitioned into a plurality of regions.

Abstract: The image processing device of the present invention maps signal values on saturation segments to corresponding signals on an achromatic axis. In conjunction with this, mapping of color signal present around the saturation segments is mapped while preserving the continuity prior to mapping. The image processing device determines the displacement level entailed in mapping color signal surround a saturation segment so as to be inversely proportional to distance from the saturation segments. Since chroma of signals on the saturation segments change precipitously before and after mapping, by mapping signal surround the saturation segments so as to preserve the continuity of the original signals of signals surround the saturation segments, chroma gradation of signals on the saturation segments and signals around saturation segments can be preserved with a high degree of accuracy.

Abstract: A method for producing an extended color gamut luminance-chrominance digital image from a captured digital image includes determining an estimate of the colors of the captured digital image of an original scene and further processing to produce an extended range output RGB image value including values outside the range that can be displayed on the output image display device, and producing an extended color gamut luminance-chrominance digital image by transforming the extended range output RGB image values to a luminance-chrominance representation.

Abstract: A device for producing a video image sharpness improvement signal (DOC21-DOC22), with black level clipping of an associated video signal, comprises a differential transconductance stage processing the video signal and whose bias currents (Imax) are directly proportional to the active component (?V) of the video signal so as to bring about a black level sharpness improvement signal clipping.

Abstract: A system and method for automatically adjusting color parameters during a film-to-digital transfer. An operator uses standard telecine equipment to preview scenes in order to determine a natural clustering of fields or scenes. Each cluster is processed separately. All the fields in a cluster are treated as one unit in the sense that color adjustments for the cluster are based on the cluster color histogram, which is computed by aggregating the colors from all pixels in the cluster. Constraints are specified for the cluster. Variables of a constraint may be automatically specified or determined by an operator based on observing sample frames from the cluster. In addition, the operator can nullify a constraint if desired. Within each cluster, the system adjusts red, green and blue intensities of the digitizing device, gains for each of these color channels, and other parameters. The system first determines which settings respect the constraints and then optimizes the solution.

Abstract: A digital camera includes a CCD imager. When a display-use UYV signal is generated on the basis of an RGB signal of an object image photographed by the CCD imager, a CPU detects a color saturation degree of the RGB signal and reduces dynamic range of a U signal and a V signal on the basis of the detected color saturation degree. Thus, a color on the basis of the U signal and the V signal is aboundingly included within a color reproducing range of a monitor.

Abstract: The present invention is directed to an improved system and methodology for generating ink/media transforms. A preferred methodology comprises one or more of the following steps: selecting the ink type; selecting the color set; selecting the media type; selecting the ink saturation level; generating a set of “linearization” color samples, or “ramps”; measuring the linearization ramps; generating a set of “target” color samples, or “patches”; measuring the target patches; screening the target patches and generating the boundary surface of a printer's gamut; implementing an under-color removal (UCR) and black generation (BG); and building the Printer Profile, Transforms and ICC Color Profiles.

Abstract: In general, the invention relates to techniques for reconstructing color channels in a multi-channel display device. The invention may be particularly useful in reconstructing the light source spectra for the color channels of liquid crystal displays (LCD). In order to accurately model and calibrate a display device, an accurate light source spectrum estimate for each of the individual color channels is needed. In accordance with the invention, a light source spectrum can be determined for each color channel of a display based on measured emission spectra for the color channels, an inverted contrast ratio for the display, and an assumed transmission spectrum for a light valve in the display. The invention provides techniques to compensate for light leakage from adjacent color channels with regards to wavelength dependent transmissions that cause hue shifts in images reconstructed by the display device.