Color signal processing and color profile creation for color image reproduction
First Claim
1. A signal processing method for converting color value information represented in a uniform color space into a set of five output color levels of black, light black, and three chromatic colors, the method comprising:
- determining a black output level based on the color value information;
determining a light black output level based on the black output level and the color value information;
determining output levels of the three chromatic colors such that the determined output levels are colorimetrically consistent with the color value information;
acquiring a plurality of the sets of the five output color levels of the five color components for a plurality of the color values;
evaluating at least ink consumption and granularity of a reproduced image based on the acquired sets of the five output color levels; and
performing nonlinear optimization for optimizing the black output level based on the evaluation result.
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Abstract
A signal processing method for converting input color value information (Lab) represented in a uniform color space into a set of five output color levels of black, light black, and three chromatic colors (CMYKLk) is provided. A black output level (K) is determined based on the input color value information. Then, a light black output level (Lk) is determined based on the black output level and the input color value information. Output levels of the three chromatic colors (CMY) are also determined such that the determined output levels are colorimetrically consistent with the input color value information.
47 Citations
14 Claims
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1. A signal processing method for converting color value information represented in a uniform color space into a set of five output color levels of black, light black, and three chromatic colors, the method comprising:
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determining a black output level based on the color value information; determining a light black output level based on the black output level and the color value information; determining output levels of the three chromatic colors such that the determined output levels are colorimetrically consistent with the color value information; acquiring a plurality of the sets of the five output color levels of the five color components for a plurality of the color values; evaluating at least ink consumption and granularity of a reproduced image based on the acquired sets of the five output color levels; and performing nonlinear optimization for optimizing the black output level based on the evaluation result. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A signal processing method for converting color value information represented in a uniform color space into a set of five output color levels of black, light black, and three chromatic colors, the method comprising:
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determining a light black output level based on the color value information; determining a black output level based on the light black output level and the color value information; determining output levels of the three chromatic colors such that the determined output levels are calorimetrically consistent with the color value information; acquiring a plurality of the sets of the five output levels of the five color components for a plurality of color values; evaluating at least ink consumption and granularity of a reproduced image based on the acquired sets of the five output color levels; and performing nonlinear optimization for optimizing the light black output level based on the evaluation result. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification