Methods and apparatus for calibrating a color display
First Claim
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1. A color rendering system comprising:
- a display having a screen for output of a rendering of digital image data represented by pixels in a plurality of color channels, wherein said display has a white balance, and said pixels are in a physical structure with respect to said screen;
a controller for driving said color channels of said rendering on said display;
a programmable processor having a network interface enabling communication with a source of said digital image data, wherein said controller operates responsive to said programmable processor to output said rendering, and said controller is provided in one of said display or said programmable processor;
memory for storing at least calibration data and one or more programs, wherein said calibration data comprise;
settings for at least gain and offset in each of said color channels that result from an initial calibration to establish at least said white balance for said display within a criterion for color error; and
tonal transfer curves for each of said color channels that conform to a target tonal gradation expressed in device-independent units; and
wherein said one or more programs comprise;
a program operable to correct errors of color reproduction that are due to differences in the amount of light emitted, for spatially uniform input, by differently situated pixels across the surface of said display, without modifying said structure of said pixels with respect to said screen;
a program operable to modify said calibration data responsive to differences between measured and desired colors on said display, wherein said desired colors are one or both of colors represented in said digital image data, or colors representing the white balance and tone reproduction of the display preferred by a user, and wherein said measured colors are representative of one or both of instrumental measurements in device-independent units or visual judgments; and
a program that provides said rendering of said digital image data upon said display in accordance with one or more color transformations responsive to said calibration data, wherein said display represents a plurality of display panels which render a composite of said rendering of said digital image data, or a single display panel that provides said rendering of said digital image data.
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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.
198 Citations
23 Claims
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1. A color rendering system comprising:
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a display having a screen for output of a rendering of digital image data represented by pixels in a plurality of color channels, wherein said display has a white balance, and said pixels are in a physical structure with respect to said screen; a controller for driving said color channels of said rendering on said display; a programmable processor having a network interface enabling communication with a source of said digital image data, wherein said controller operates responsive to said programmable processor to output said rendering, and said controller is provided in one of said display or said programmable processor; memory for storing at least calibration data and one or more programs, wherein said calibration data comprise; settings for at least gain and offset in each of said color channels that result from an initial calibration to establish at least said white balance for said display within a criterion for color error; and tonal transfer curves for each of said color channels that conform to a target tonal gradation expressed in device-independent units; and wherein said one or more programs comprise; a program operable to correct errors of color reproduction that are due to differences in the amount of light emitted, for spatially uniform input, by differently situated pixels across the surface of said display, without modifying said structure of said pixels with respect to said screen; a program operable to modify said calibration data responsive to differences between measured and desired colors on said display, wherein said desired colors are one or both of colors represented in said digital image data, or colors representing the white balance and tone reproduction of the display preferred by a user, and wherein said measured colors are representative of one or both of instrumental measurements in device-independent units or visual judgments; and a program that provides said rendering of said digital image data upon said display in accordance with one or more color transformations responsive to said calibration data, wherein said display represents a plurality of display panels which render a composite of said rendering of said digital image data, or a single display panel that provides said rendering of said digital image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification