Color image processing method and apparatus capable of adjusting

Details Color image processing method and apparatus capable of adjusting Color image processing method and apparatus capable of adjusting

1993-10-20

1996-03-26

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358520, 358529, H04N 156, H04N 160

Patent

active

055025790

ABSTRACT:
A lightness/chromaticity separation device converts three input color signals to {L*, a*, b*} signals. A chroma determination device determines a chroma signal C* based on the {a*, b*} signals. An UCR ratio calculation device calculates an UCR ratio .alpha. according to a C*-.alpha. function that is adjustable by changing parameters. A nonlinear conversion circuit determines output color signals of four colors including black based on the {L*, a*, b*} signals and the UCR ratio. The nonlinear conversion circuit includes a network-type combination of a plurality of analog nonlinear operation units.

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"Proceedings of 1st Joint Conference on Color Technology," Four Optics Society, Nov. 20-21, 1984, pp. 1-7.
"Principles of Color Reproduction Applied To Photomechanical . . . " by J.A.C. Yule, Publication Department of Printing Society, 1971 pp. 247-248.

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