Method for determining color data

Details Method for determining color data Method for determining color data

1995-07-07

1998-03-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358518, 358529, 382162, G03F 308

Patent

active

057293627

ABSTRACT:
Density data for reproducing an image using the four colors yellow, magenta, cyan and black is based on image data pertaining to chroma, luminosity and hue. The density ratio of two color components, from the three colors yellow, magenta and cyan, is first determined for a given hue. This ratio is then maintained constant while the color value for desired chroma and luminosity is determined. Finally, the density value for black is determined to reproduce a desired color. If the desired color lies outside a reproducible color gamut, a substitute color is chosen which has the same luminosity and hue as the desired color, and the maximum reproducible chroma within the gamut.

REFERENCES:
patent: 4989079 (1991-01-01), Ito
patent: 5448379 (1995-09-01), Ishihara et al.
patent: 5463480 (1995-10-01), MacDonald et al.
patent: 5502579 (1996-03-01), Kita et al.
patent: 5631749 (1997-05-01), Ueda
Maureen C. Stone & John C. Beatty; Color Gamut Mapping & The Printing of Digital Color Images, Oct. 1988, pp. 249-292.

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