Method for creating conversion table for color copier

Details Method for creating conversion table for color copier Method for creating conversion table for color copier

2007-09-18

2007-09-18

Williams, Kimberly (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S523000, C382S162000, C382S167000

Reexamination Certificate

active

10309090

ABSTRACT:
L*a*b* values of an original image are obtained by measuring 6,000 color patterns with a colorimeter. RGB data for the 6,000 color patterns is also obtained by scanning the 6,000 color patterns with the color copier. The colorimeter is used to measure an image, which has been printed by the color copier based on CMY data for about 5,000 colors that is generated by a personal computer, in order to obtain L*a*b* values corresponding to the about 5,000 colors of CMY data. Then, CMY data corresponding to the L*a*b* values for the 6,000 colors is determined based on the relationship between the CMY data and L*a*b* values for the about 5,000 colors using a triangular pyramid interpolating method, thereby determining CMY data corresponding to the 6,000 colors of RGB data. The thus obtained RGB-CMY relationship data for 6,000 colors is compressed into RGB-CMY relationship data for 729 colors, using triangular pyramid interpolation, to obtain a conversion table.

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