Reduction of false contours by chrominance modulation

Details Reduction of false contours by chrominance modulation Reduction of false contours by chrominance modulation

1997-03-27

1999-10-12

Au, Amelia

Image analysis

Color image processing

Color correction

358520, 358523, 358534, 348631, G06K 900, G03F 308

Patent

active

059664614

ABSTRACT:
A system and method for eliminating luminance false contours within rendered documents by sacrificing chrominance accuracy within printer halftones and for using the reduction of chrominance to improve the luminance correctness for any requested color. Ordinary halftone processes are modified such that small hue shifts are traded off for the ability to eliminate luminance false contours. Luminances of colored inks are created in a manner that turns on only one color spot at a time, instead of all three, within a slowly changing gray area because numerically equivalent steps in chrominance are much less visible in printed form than changes in luminance. Removal of false contours is therefore achieved by chrominance variations rather than by spatial variations in a document.

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"Bit-Stealing: How to Get 1786 Gray Levels from an 8 Bit Color Monitor" by S. W. Tyler et al. presented at the 1992 SPIE/S&T Symposium on Electronic Imagaing Science and Tech. vol. 1666.

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