System for controlling an amount of undercolor removal based on

Details System for controlling an amount of undercolor removal based on System for controlling an amount of undercolor removal based on

1997-01-13

2000-07-11

Coles, Edward L.

Image analysis

Color image processing

Color correction

358 19, 358521, 399 40, 399231, G06K 900, G03F 308, G03G 1501

Patent

active

060884770

ABSTRACT:
A color image processing system for performing undercolor removal. The system includes input of a color image signal, generation of a grayness signal from the color image signal, generation of a darkness signal from the color image signal, and performance of undercolor removal based on the grayness signal, the darkness signal, and a black signal corresponding to the color image signal. The system also includes control of an amount of undercolor removal performed on the color image signal so that a gradient of an amount of undercolor removal performed on the color image signal relative to the grayness signal at a first darkness signal level is lower than a gradient of an amount of undercolor removal performed on the color image signal relative to the grayness signal at a second darkness signal level, wherein the second darkness signal level is lower than the first darkness signal level.

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Shimizu, Toshihiro, Undercolor Removal Method and Device, PTO 98-2718 (translation), Japanese Kokai Patent Application No. Sho 56[1981]-135842, 1981, pp. 1-19.

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