Color transformation with black preservation

Details Color transformation with black preservation Color transformation with black preservation

2011-08-09

2011-08-09

Haskins, Twyler L (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S002100, C358S003040, C358S515000, C358S518000, C358S519000, C358S529000, C382S162000, C382S167000

Reexamination Certificate

active

07995237

ABSTRACT:
The present invention transforms a source device colorant value to a destination device colorant value, by determining whether all non-black colorant values of the source device colorant value are zero, transforming the source device colorant value to a colorimetric value using a source device model, transforming the colorimetric value to a gamut-mapped colorimetric value using a user-selectable gamut-mapping model, and selecting a destination device colorant value based on the determination. In a case where all of the non-black colorant values of the source device colorant value are zero, the destination device colorant value is selected so that its black colorant value reproduces a lightness of the gamut-mapped colorimetric value, and all of its non-black colorant values are zero. Otherwise, the destination device colorant value is selected so that a combination of its non-black and black colorant values reproduces the gamut-mapped colorimetric value. Accordingly, black content is preserved while accommodating a user-selectable gamut-mapping model.

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