Chroma control method

Details Chroma control method Chroma control method

1989-05-23

1990-10-16

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Methods

355 32, 355 35, G03B 2732

Patent

active

049639250

ABSTRACT:
The improved method of chroma control for use in a color image forming appartus such as a digital color copier comprises the steps of: reading information on a color original; transforming the density of each of three original colors, red, green and blue, to an associated hue, lightness and chroma; controlling said chroma; combining the controlled chroma with said hue and lightness; transforming the combinations to colorant densities; and outputting a color image based on said colorant densities. The method allows only chroma to be controlled without affecting hue and lightness, thereby enabling the user to copy color originals with the tone of the copy controlled as freely as he likes.

REFERENCES:
patent: 4687334 (1987-08-01), Miyakawa
patent: 4872034 (1989-10-01), Ohta et al.

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