Abstract: In the different mapping planes, described by plane coordinates, of the color space in which colors to map are represented, a uniformity testing curve can be found that intersects all mapping trajectories of this mapping plane and, at any intersection of a mapping trajectory with said uniformity testing curve, the gradients calculated in said plane coordinates of the intersecting mapping lines and the first derivation along this uniformity testing of these gradients are continuous. Thank to the invention, colors are better preserved after mapping, even if there are different mapping methods in the same mapping plane.

Abstract: Methods for controlling light sources in displays in response to image data determine both a central tendency for brightness and an upper extreme for brightness of an area of an image. Brightness of a light source is controlled based upon both the central tendency and the upper extreme. Controllers in displays such as televisions, computer monitors, digital cinema and the like may control light source in a manner that reduces or avoids perceptible haloing.

Abstract: Restriction information on a total colorant amount for a medium is obtained. Patches at grid points in a color space corresponding to a plurality of colorants at which the total colorant amount falls within a restriction represented by the restriction information, and a patch at a point surrounded by the patches are generated. Color values are obtained by measuring the colors of the patches printed on the medium. It is determined based on a color prediction value between the grid points whether the measured color values are appropriate, and if so, a color value at a grid point at which the total colorant amount exceeds the restriction is estimated based on the measured color values. A color separation table is created based on the measured color values and the estimated value.

Abstract: A color processing apparatus includes an image signal acquisition section, a color conversion matrix storage section, a matrix regularization processing section and a normal color conversion section. The image signal acquisition section acquires an image signal containing a predetermined input color signal. The color conversion matrix storage section stores information of a color conversion matrix which associates the input color signal and an output color signal with each other. The matrix regularization processing section reads the information of the color conversion matrix from the color conversion matrix storage section and converts the color conversion matrix into a nonsingular matrix. The normal color conversion section converts the input color signal acquired by the image signal acquisition section into an output color signal using the nonsingular matrix.

Abstract: In order to improve the accuracy of a code amount estimated by using a predictive residual when coding at a low data rate, an encoder is utilized to perform picture coding processing on a picture to be coded which is an input signal, by using a technique such as H.264. Specifically, a code amount predictor predicts the code amount on the basis of an evaluation value obtained by predictive-residual code amount evaluation value generating unit, a coding-condition code amount evaluation value generating unit, and a motion-vector-information code amount evaluation value generating unit. The predicted code amount is used for controlling coding in the encoder.

Abstract: In accordance with one embodiment, a method for emulating the color performance of a display system includes determining an expected first color gamut of the display system. Display data is converted into a format that emulates the first color gamut. The converted display data is displayed by a different display system having an expected second color gamut different than the expected first color gamut.

Abstract: In certain exemplary embodiments, data representative of a color scheme including a plurality of colors is maintained, a parameter for each of the colors is shifted by a same offset to generate another color scheme, and the other color scheme is associated with a graphical user interface. In certain embodiments, the shifting preserves at least one of a hue relationship and a contrast relationship between the colors in the color scheme. In certain embodiments, at least one user interface tool configured to facilitate a user selection of one of the colors included in the color scheme and a change to be applied to the color, and the same offset is determined based on the user selection.

Abstract: The color printing control device outputs color material reduction processed data generated by applying a color material reduction process to each pixel of bitmaps converted to color material colors to be used in printing, when it is judged that the color material reduction printing mode is specified. The color material reduction process includes chroma conversion that reduces chroma and under-color removal/black generation that replaces at least a portion of achromatic components generated by overlaying of a plurality of color materials.

Abstract: A color gamut component analysis apparatus having a histogram processing unit 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 the histogram processing unit; and a graphic processing section that generates and outputs a user interface image which shows the presence of the wide color gamut component in the video signal or the ratio of the wide color gamut component to the video signal.

Abstract: Methods for gamut mapping and boosting a color saturation of a color signal having multiple colors and a color value for each color. An example method includes mapping each color from a first to a second color space, adjusting each color in the mapped color signal including boosting a color saturation; determining a maximum color value of the color signal; and, in response to a determining that the maximum color value exceeds a maximum displayable color value, setting the color value of the color having the maximum color value to be equal to the maximum displayable color value and scaling color values of colors not having the maximum color value.

Abstract: A method for setting a color conversion condition for use in an image forming device. The image forming device includes: a first color conversion unit that converts input image data into first output image data by using a first three-dimensional LUT; and second-first, second-second and second-third color conversion units for sequentially converting the input image data into intermediate image data ? and ? by using at least one LUT. The method includes: setting, in a form of values expressing a color conversion relationship on a second three-dimensional LUT, a relationship between the intermediate image data ? and the intermediate image data ? to ensure that first colorimetric data of an image formed on the basis of the first output image data is equal to third colorimetric data of an image that is formed on the basis of image data obtained by sequentially converting the same input image data.

Abstract: Machine-enabled methods of, and devices for, encoding color bitmap data as indexed red-green-blue (RGB) data for display.

Abstract: Each of a plurality of polyhedron spaces is defined by a plurality of first vertices. Each of the plurality of first vertices is defined by a plurality of sets of third color data that are defined in the second color space. A color data setting unit sets a plurality of sets of fourth color data that are defined in a first color space in one to one correspondence with the plurality of third color data sets. A second dividing unit divides each of a plurality of polyhedron spaces into a plurality of smaller polyhedron spaces by a division number set for the each polyhedron spaces. Each of the plurality of smaller polyhedron spaces is defined by a plurality of second vertices and the plurality of first vertices. Each of the plurality of second vertices is defined by a plurality of sets of fifth color data defined in the second color space.

Abstract: A method and apparatus for processing image pixel signals having at least two color components in which at least some of the image pixel signals are classified into a plurality of classifications and transformed by a transform function associated with the classifications.

Abstract: Color is edited using a color representation including digital values B (brightness), e and f such that B=?{square root over (D2+E2+F2)}, e=E/B, f=F/B, where DEF is a linear color coordinate system. Alternatively, color is represented using digital values B, C (chroma) and H (hue), where cos C=D/B and tan H=E/F. Brightness can be changed without a color shift by changing the B coordinate and leaving unchanged the other coordinates e and f or C and H. Other features are also provided. Brightness coding methods are provided to reduced the size of image data for storage and/or network transmission. The coding methods include logarithmic coding. Some embodiments use logarithmic or linear coding depending on the brightness at a particular pixel.

Abstract: A color processing apparatus for evaluating the gradation characteristic of a color conversion table that is used to convert signal values in input color space into signal values in output color space and has a plurality of grid points includes an acquisition unit configured to acquire signal values in the output color space corresponding to four adjacent grid points in the input color space through the color conversion table, a calculation unit configured to calculate a property of a tetrahedron formed by the signal values in the output color space, and an evaluation unit configured to evaluate a gradation characteristic of the color conversion table based on the property of the tetrahedron. The property of the tetrahedron may be the volume of the tetrahedron or the surface area of the tetrahedron.

Abstract: The invention relates to a method and a system for translating a three value color space signal, preferably given in a CIE scale, to an n primary color space signal, where n is an integer greater than or equal to 4, thus providing color controlling of a white light source comprising an array of colored light emitting diodes with respect to maximum CRI and maximum luminous efficiency.

Abstract: An accelerator chip can be positioned between a processor chip and a memory. The accelerator chip enhances the operation of a Java program by running portions of the Java program for the processor chip. In a preferred embodiment, the accelerator chip includes a hardware translator unit and a dedicated execution engine.

Abstract: In a method of mapping data from a source space to a target space, a space transformation look-up table (LUT) that contains a plurality of locations storing information is maintained, wherein each of the plurality of locations includes information specifying a function to be evaluated. First data defined according to a multi-dimensional source space is input, and second data defined according to a multi-dimensional target space is generated, by applying information contained in the LUT to the first data.

Abstract: A method for correcting color characteristics of a flat panel display comprises the steps of using a signal generating device to generate an input signal to the display and a color measurement instrument to measure color displayed by the display to obtain an output value; obtaining corrected color characteristic values necessary for the display to display a target output value Txyz through the relation of an inverse function RGB=f?1(XYZ) between the input signal RGB and output value XYZ, and storing the corrected color characteristic values and an identification code of the display into a storage medium. The corrected color characteristic values are downloaded to a hard disk of a computer from the storage medium according to the identification code; and the computer uses a driver of the display to activate the flat panel display to display a corrected color according to the corrected color characteristic values.

Abstract: A power function is approximated over an applicable data interval with polynomials determined by means of a Chebyshev minimax approximation technique. In some cases, multiple polynomials may be used to approximate the function over respective ranges of the desirable interval, in a piecewise manner. The appropriate polynomial that approximates the power function over the range of interest is derived and stored. When the power function is to be applied to a particular data value, the data value is first evaluated to determine where it lies within the applicable interval. The constants for the polynomial associated with that range of the interval are then retrieved and used to calculate the power of that data value.

Abstract: A plurality of one-port split lookup tables having alternately stored therein correction data corresponding to input data is provided as a lookup table that has stored therein the correction data corresponding to the input data at predetermined intervals relevant to predetermined higher-order bits. An address generating unit generates addresses for a plurality of the corresponding split lookup tables from the input data. An interpolation arithmetic unit executes interpolation arithmetic with the use of lower-order bits of the input data for readout data read from two lookup tables.

Abstract: Disclosed is an illumination system that includes a lamp assembly, a controller, a user input device, and a memory defining discrete color points and containing a ID hue table, a ID saturation table, a ID brightness table, and a boundary memory defining a boundary of the color space. On the basis of data received from the user input device and on the basis of the information in the memory, the controller generates color control signals for the lamp assembly. The controller compares the user input data with the information in the boundary memory. If the controller finds that said point is located outside the boundary of the color space, the controller calculates a replacement point on the color space boundary as defined in the boundary memory, and generates its control signals on the basis of the replacement point.

Abstract: Disclosed are a color management method, an apparatus thereof and a color management computer program for executing the method that enable a user to conveniently and easily select and/or change colors desired by the user in diverse ways. The color management method includes displaying a color scheme list that is a list of color schemes for providing a standard for converting the colors that constitute an image, and if a selection manipulation of one among the color schemes that constitute the displayed color scheme list is input, storing the color scheme selected by the selection manipulation.

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: When each value of luminance signals of three primary colors in the primary video signal is less than the output lower limit value, in short, when the gradation level is negative, the negative gradation level of the present primary color is, in accordance with its magnitude, in other words, in accordance with the absolute value of the negative gradation level, replaced with positive gradation levels of other two primary colors. Therefore, in accordance with A VIDEO SIGNAL CONVERTER of this invention, even when the primary video signal includes a signal value having a negative gradation level, in short, even when one or more of each signal value of RGB is below the output lower limit value, a color according to the combination of those gradation levels (a combination of each level of primary colors (RGB)) can be reproduced (displayed) by a display means.

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 method of retaining original natural language commands along with the mathematical LUT transform of the commands and a private tag within the same ICC profile. The private tag can be read only by an exclusive or proprietary application or color management module. When a user loads a color editing profile into the proprietary application, the natural language commands could then be read from the private tag and displayed on a user interface. The user can then immediately see the qualitative effect of the color editing profile and provide selected modifications to the commands and retain a new set of commands stored in another profile.

Abstract: A color gamut mapping method, which is capable of minimizing a color difference perceived by a person, preventing brightness and contrast from deteriorating, and improving color reproducibility, and a liquid crystal display device using the same are disclosed.

Abstract: A Personal Computer (PC) adjusts a color of an image received from a digital camera to produce an estimated reflectance spectrum and/or to convert the color to a new color space. First, an input compensation transform is generated, e.g. based on a Macbeth color chart in the image, to compensate for the sensitivity of the camera used to generate the image to different wavelengths of light and the illumination spectrum incident on an object of interest to which the image relates. In order to estimate the reflectance spectrum, a reflectance spectrum estimation transform is then generated by the PC. In order to convert the color of the image to the new color space, a color space conversion transform is generated by the PC. Both the reflectance spectrum estimation transform and the color space conversion transform are based on the input compensation transform and reference reflectance spectra stored in a reference reflectance spectra database.

Abstract: In creating a color conversion table, search time for searching a point at which a color difference with a target color corresponding to a grid point is minimum can be reduced effectively. In a predetermined grid point constituting a second pre-color processing table, a post-RGB value of a target color of the grid point is determined by interpolation computation using a first pre-color processing table created beforehand. An interpolation operation using each grid point data of a plurality of grid points in the neighborhood in the table is executed, thus the post-RGB value of an object grid point is determined. Next, a neighboring region of the obtained post-RGB value is set, and a post-RGB value of most approximate to the target color in the neighboring region is determined as grid point data of the object grid point.

Abstract: Systems, methods, and program products for subjective and locatable color theme extraction for images. Determining a color density for each of a plurality of colors in an image where each of the plurality of colors belongs to a color space, extracting one or more distinct theme colors from the plurality of colors based on qualitative parameters and the determined color densities, and mapping each extracted theme color to a color occurring in the image where the mapping is based on a color distance between the theme color and colors occurring in the image.

Abstract: OSD data YD includes a color designating signal As and a color changing signal Ex. When a color register number is designated by the color designating signal As, a color storage unit 41 outputs an appropriate color signal. A Y signal is branched from the outputted color signal and subjected to a modulating process by the color changing signal Ex. The Y changing signal obtained by the modulating process is merged with a Cb signal and a Cr signal so as to form new color signal. The OSD data YD with changed color is subjected to a synthesizing process with image data XD according to the predetermined mixture ratio.

Abstract: An image adjustment includes adapting a universal palette to generate (i) an input image palette statistically representative of pixels of an input image and (ii) a reference image palette statistically representative of pixels of a reference image, and adjusting at least some pixels of the input image to generate adjusted pixels that are statistically represented by the reference image palette. In some embodiments, a user interface for controlling the image adjustment includes a display and at least one user input device, the user interface displaying a set of colors indicative of the regions of color space represented by a palette and receiving a selection of one or more regions of the color space, so that the image adjustment adjusts those pixels of the input image lying within the one or more selected regions of the color space.

Abstract: Complicated adjustment, such as adjusting hue and saturation by varying value for each hue in which hue correction and saturation correction are performed on only an input having a specific value of a specific color component, is performed. In a color space including hue Hi, saturation Si, and value Vi, calculating a hue correction value HVh and a saturation correction value HVs by using the hue Hi and the value Vi as parameters allows the hue correction and the saturation correction to be performed based on the value and completely independently for hue axes of the hue. The correction value calculating circuit scale has no influence on the complexity of the correction. It is possible to calculate the correction values by a certain circuit scale no matter how complicated the correction is.

Abstract: Aspects of the present invention relate to systems and methods for color image hue shifting. Some aspects relate to processes by which reference hue values and corresponding hue shift values are used to modify color hue values in a non-perceptually-uniform color space. Some aspects relate to processes that generate a hue shift table for modifying image hue values.

Abstract: When generating a color conversion table for converting a device independent color into a device color, a conversion target color of the device independent color corresponding to a lattice point of the color conversion table is set based on color reproduction information indicating the relationship between the device color and device independent color. The conversion target color is changed to generate a plurality of neighbor colors of the conversion target color. The conversion target color and the plurality of neighbor colors are converted into device colors based on the color reproduction information, and the device color corresponding to the conversion target color is calculated from the conversion results.

Abstract: The disclosed implementations relate generally to 3D histograms and other user interface elements for color correcting digital images. A color correction method includes: generating a user interface for display on a display device, the user interface including a display area; generating a three-dimensional cube representing a color space for display in the display area; and generating a plurality of spheres for display within the cube, where the spheres are sized to represent pixel densities in a digital image.

Abstract: A computer system (810) receives a desired upper bound ?Smax for a relative quantization step ?S??S??/?S?? to be used when quantizing any color in some range of colors. Here S? and S? are adjacent colors in the set of colors to be made available for the quantized image, and ?·? is a norm in a 70%-orthonormal linear color coordinate system, the norm being the square root of the sum of squares of the tristimulus values. The computer system determines (510) suitable quantization steps for the brightness coordinate (B) and the chromatic coordinates (e,ƒ) in anon-linear color coordinate system, and quantizes (520) the brightness and chromatic coordinates accordingly.

Abstract: Disclosed herein is an image signal processor for carrying out conversion into an xvYCC signal by using a photograph film as a material, the image signal processor including: acquisition means for acquiring print film concentration data based on said photograph film; generation means for generating spectral data on an image on a screen previously presumed based on spectral concentration characteristics of colors of a positive film having an image projected on said screen, a spectral distribution of a projection light source, and the print film concentration data; arithmetical operation means for arithmetically operating an XYZ tri-stimulus value corresponding to the spectral data; and conversion means for converting the XYZ tri-stimulus value into the xvYCC signal.

Abstract: Displaying colors in a color selection interface is disclosed. Displaying includes identifying a first plurality of colors associated with a color selection interface, mapping each color in the first plurality of colors to an allowed color in an allowed color set of one or more colors to obtain a second plurality of colors, wherein mapping is performed based at least in part on a color lookup table, and visually displaying the second plurality of colors in the color selection interface, wherein the color selection interface is configured to receive a color selection from the second plurality of colors.

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: Pixel data is stored in a field corresponding to a pixel of an image. The field includes an opacity bit and a set of bits. If the opacity bit is set to an opaque-indicating state, then a color level value of a component color of the pixel is stored in the set of bits. However, if the opacity bit is set to a transparency-indicating state, then a transparency level value is stored in at least one bit of the set of bits and the respective color level value is stored in other bits of the set of bits.

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 method of displaying on a display a visual reproduction of an original scene with a preferential tone mapping; said display having a selected display white point and a selected display black point separated by more than 3.5 decades of luminance; the method comprising the steps of capturing original scene parameters, performing a transformation on said captured scene parameters, and displaying a visual reproduction of the scene on the display from the transformed captured scene parameters; wherein said transformation, taken in conjunction with untransformed characteristics of the capturing and displaying steps, results in a reproduced tone mapping having: a. a dynamic range greater than 3.5 decades; b. a first derivative value of minus log reproduced luminance relative to log original scene luminance between ?1.1 and ?1.51 inclusive for a log scene luminance of ?0.6, measured relative to a 100% diffuse reflector in the original scene; c. a first derivative value less than or equal to ?1.

Abstract: A color conversion device that color-converts colors of input image data into colors used in a display unit for displaying images using at least white includes: a ratio calculating unit that calculates a lightness ratio and a saturation ratio between a color reproduction range in the standard color space and a color reproduction range in colors used by the display unit in L*a*b* space at least when a color outside of the color reproduction range in colors used by the display unit is calculated; and a color compressing unit that performs color compression on the image data based on the ratios calculated by the ratio calculating unit.

Abstract: Determination of a grid structure for a set of values in a device color space, in which heuristics are applied to a collection of color sample data in order to determine the structure of a look-up table that best fits the samples. Sampling data is sorted for each channel thereof, and the number of steps in each channel is counted. The data is checked for completeness. Steps are removed if they do not correspond to steps on the axes of a three-dimensional cube. If, as a result of step removal, a full LUT has been obtained, then the structure of the LUT has been determined and the process ends. On the other hand, if a full LUT has not been obtained, then steps are removed if they are under-correlated with other steps.

Abstract: A color processing apparatus includes a calculation unit configured to calculate a correction value from reference color information in an input color gamut and reference color information in a reference color gamut, a correction unit configured to correct reference target color information in the reference color gamut based on the correction value to calculate target color information, and a color conversion unit configured to convert an input color in the input color gamut into an output color within an output color gamut by using the target color information.

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: A process and system for depicting a combination of process colors and spot colors on a radiant light source such as a computer monitor screen. The invention provides a user-definable “meta-ink” color which is made up of the components of the process colors and the spot colors. Shade values are assigned to each of these components to create the meta-ink color. This meta-ink color then replaces the document color for visual depiction on the radiant light source. This process and system provides a more accurate depiction of the representation of the printed image.