Method of creating lookup table for color conversion

Details Method of creating lookup table for color conversion Method of creating lookup table for color conversion

2007-03-27

2007-03-27

Williams, Kimberly (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900, C358S525000, C345S601000, C345S602000, C345S604000, C345S606000

Reexamination Certificate

active

10301568

ABSTRACT:
After determining a CMYK-to-Lab relationship, a Lab lattice-to-CMYK relationship is determined. The Lab lattice-to-CMYK relationship defines, for each Lab lattice point, a plurality of allowable CMYK data sets. Then, for each Lab lattice point, several allowable CMYK data sets with the largest K value are first selected among the plurality of CMYK data sets. Then, one CMYK data set with the smallest color distance from the subject Lab lattice point is selected among the several allowable CMYK data sets. If the subject Lab lattice point falls within the color reproducible range for the value of K of the selected CMYK data set, the selected CMYK data set is finally determined for the subject Lab lattice point. It is possible to create a lookup table, in which each Lab lattice point falls within the color range of the K value in the corresponding CMYK data set.

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