Method and apparatus for calculating color gamuts
First Claim
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1. Method for obtaining a description of a color gamut for a color reproduction device, describing said color gamut by a plurality of closed contours, each situated on one surface in color space, comprising the following steps:
- characterizing said color reproduction device by a printer model for transforming a set of colorant values in colorant space to a set of color values in color space;
extracting at least one 3-ink process from said printer model;
per extracted 3-ink process, determining a 3-ink printer model of said extracted 3-ink process, determining a Jacobian of said 3-ink printer model, determining a determinant of said Jacobian, and determining at least one surface in colorant space by setting said determinant to zero;
per extracted 3-ink process determining a plurality of curves in colorant space, each curve being based upon;
said printer model;
one surface in color space; and
,at least one colorant boundary or at least one colorant limitation or at least said surface in said colorant space;
transforming each curve to a contour segment in color space, according to said printer model;
per extracted 3-ink process taking an envelope of all the contour segments in color space to form at least one closed contour;
taking a union of said closed contours from extracted 3-ink processes.
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Abstract
A method and an apparatus for obtaining a gamut description of a multidimensional color reproduction device. The method is based on the transformation of several types of colorants boundaries that map to the boundaries of the color gamut of the device in color space.
75 Citations
6 Claims
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1. Method for obtaining a description of a color gamut for a color reproduction device, describing said color gamut by a plurality of closed contours, each situated on one surface in color space, comprising the following steps:
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characterizing said color reproduction device by a printer model for transforming a set of colorant values in colorant space to a set of color values in color space; extracting at least one 3-ink process from said printer model; per extracted 3-ink process, determining a 3-ink printer model of said extracted 3-ink process, determining a Jacobian of said 3-ink printer model, determining a determinant of said Jacobian, and determining at least one surface in colorant space by setting said determinant to zero; per extracted 3-ink process determining a plurality of curves in colorant space, each curve being based upon; said printer model; one surface in color space; and
,at least one colorant boundary or at least one colorant limitation or at least said surface in said colorant space; transforming each curve to a contour segment in color space, according to said printer model; per extracted 3-ink process taking an envelope of all the contour segments in color space to form at least one closed contour; taking a union of said closed contours from extracted 3-ink processes. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification