Method and apparatus for extracting black color component

Details Method and apparatus for extracting black color component Method and apparatus for extracting black color component

1989-04-04

1991-01-15

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, H04N 146

Patent

active

049857592

ABSTRACT:
A black color component extracting apparatus used for a color image reproducing machine. The apparatus includes a hue area judgement unit for judging to which hue area among at least three predetermined hue areas the hue represented by input color image signals belongs. With respect to the judged hue area according to this judgement, the black color extraction parameters are set, and in accordance with the set black color extraction parameters, black color component is extracted. The black color extraction parameters are determined from two chromatic colors P and Q positioned in respective boundary planes which defines the judge hue area, and from an achromatic color N.

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