Back to results
US 7,072,072 B1Granted
Color rendering optimized for text and line art
AssigneeXerox Corporation
InventorsThyagarajan Balasubramanian, Reiner Eschbach
Life of this patent
Estimating the term…
Abstract
A pure rendering intent is used to render text and line art in color imaging systems. A CMY image goes through a one hundred percent under color removal process creating a CMYK image. The CMYK image is processed by a set of clamping tone reproduction curves. The clamping tone reproduction curves shift nearly saturated colors to total saturation. The result is a rendering of text and line art that has improved clarity and legibility.
Claims19
A method for rendering an image, comprising:
- accepting an image represented as a set of pixels, each pixel representing colors with a set of colorants, each pixel calling for a level of saturation for each colorant in the set of colorants;
- mapping pixels representing neutral and nearly neutral colors to pixels rendered with only a neutral colorant;
- and
- mapping pixels representing nearly pure primary colors to pixels representing pure primary colors, whereby text and line art is rendered more clearly, for limiting displeasing moiré patterns and halftone registration errors.
1 more element
A color image rendering device comprising:
- a neutral color mapper configured to map pixels of an image representing neutral and nearly neutral mixtures of colorants to pixels rendered with only a neutral colorant, and
- a primary color mapper configured to map pixels of the image representing nearly pure primary colors to pixels representing corresponding pure primary color, whereby text and line art is rendered more clearly for limiting displeasing moiré patterns and/or halftone registration errors.
Dependencies are inferred from the claim text.