Balancing grays on color printers
AssigneeXerox Corporation
InventorsMeng Yao, Martin S. Maltz
Life of this patent
Estimating the term…
Abstract
A gray balancing technique wherein gray balancing curves are determined by interpolating the primary color data values of color samples to determine discrete combinations of primary colors that substantially match predetermined targets, and performing a curve fitting procedure on the discrete combinations of primary colors to produce gray balancing curves.
Claims18
A method of gray balancing comprising:
- printing a plurality of color samples that encompass predetermined gray targets, wherein the plurality of color samples are printed pursuant to a plurality of combinations of CMY values;
- measuring the color of the color samples in a predetermined color space to produce colorimetric data for the color samples;
- interpolating the CMY values of the color samples using the calorimetric data to determine discrete CMY combinations that substantially match the predetermined gray targets;
- performing a curve fitting procedure on the discrete CMY combinations to produce gray balancing curves;
- and
- modifying CMY data values for a pixel in accordance with the gray balancing curves.
A method of gray balancing comprising:
- printing a plurality of color samples that encompass predetermined gray targets pursuant to a plurality of combinations of CMY data values;
- measuring the color of the color samples in a predetermined color space to produce colorimetric data for the color samples;
- interpolating the CMY data values of the color samples in the predetermined color space using tetrahedral interpolation to determine discrete CMY combinations that substantially match the predetermined gray targets;
- performing a curve fitting procedure on the discrete CMY combinations to produce gray balancing curves;
- and
- modifying CMY data values for a pixel in accordance with the gray balancing curves only if the CMY data values include a gray component.
A method of gray balancing comprising:
- adjusting CMY data values for a pixel pursuant to gray balancing curves generated by performing a curve fitting procedure on discrete CMY combinations that substantially match predetermined gray targets, wherein the discrete CMY combinations were generated by interpolation of CMY data values of color samples that encompass predetermined gray targets.
A method of gray balancing primary color data values for a pixel, wherein the primary color data values include a value for each of a plurality of primary colors, comprising:
- printing a plurality of color samples that encompass predetermined gray targets, wherein the plurality of color samples are printed pursuant to a plurality of combinations of primary color data values;
- measuring the color of the color samples in a predetermined color space to produce colorimetric data for the color samples;
- interpolating the color data values of the color samples using the colorimetric data to determine discrete color data combinations that substantially match the predetermined gray targets;
- performing a curve fitting procedure on the discrete primary color data combinations to produce gray balancing curves;
- and
- modifying primary color data values for a pixel in accordance with the gray balancing curves.
Dependencies are inferred from the claim text.