Facsimile and static presentation processing – Natural color facsimile – Black signal synthesis
Patent
1995-04-19
1998-06-30
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Black signal synthesis
358518, H04N 129
Patent
active
057742383
ABSTRACT:
In reproducing an input RGB (red, green, and blue) color defined by particular tristimulus values by CMYK (cyan, magenta, yellow, and black) ink, color samples having a plurality of colors at controlled amounts of CMY (cyan, magenta, and yellow) with respect to a plurality of different amounts of K (black) ink are measured to be used as an original CMYK color reproduction zone. The original CMYK color reproduction zone is divided into individual CMYK color reproduction zones for each respective amount of the K ink. The individual CMYK color reproduction zones are memorized. All of the individual CMYK color reproduction zones are searched in response to the input RGB color defined by the particular tristimulus values to obtain at least one set of the amounts of the CMYK ink corresponding to the input RGB color. When a plurality of sets of the amounts of the CMYK ink are obtained, there sets are memorized as memorized sets of the amounts of the CMYK ink. Two sets of the amounts of the CMYK ink are selected from the memorized sets as selected sets of the amounts of the CMYK ink in accordance with a preselected K ink adjustment coefficient and interpolation is carried out using the K ink adjustment coefficient as a value of an interior division ratio to obtain a single set of the amounts of the CMYK ink corresponding to the input RGB color.
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Brinich Stephen
Coles Sr. Edward L.
NEC Corporation
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