Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-06-15
1997-12-16
Bost, Dwayne
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358518, 358520, 358525, 358523, G06K 1500, G03F 308, H04N 146
Patent
active
056994915
ABSTRACT:
A color printer driver for a printer includes a reproduction look-up table (LUT) which stores CMY values for colors both in-gamut and out-of-gamut of the printer. For close-in out-of-gamut colors, the reproduction LUT stores perceptually matched CMY values whereas for far-out-of-gamut colors, the reproduction LUT stores saturation matched CMY values. CMY values for the out-of-gamut colors are obtained by a dual-cone gamut mapping technique in which an actual cone of N-cone arranged surfaces is defined so as to mimic the actual gamut of the printer, an ideal cone of M-cone arranged surfaces is defined so as to mimic an ideal gamut such as the gamut of a typical color monitor, a target out-of-gamut color is projected onto the actual cone and de-saturated until an in-gamut CMY value is obtained, the same target color is projected onto the ideal cone to obtain a fully-saturated CMY value, and a weighted average is obtained of the in-gamut CMY value and the fully-saturated CMY value, the weight being based on a measure of distance between the out-of-gamut target color and its projection onto the actual cone.
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Bost Dwayne
Canon Information & Systems, Inc.
Legree Tracy M.
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