Gamut mapping with primary color rotation

Details Gamut mapping with primary color rotation Gamut mapping with primary color rotation

2004-05-06

2009-10-13

Nguyen, Madeleine A (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Color correction

C358S523000, C358S001900

Reexamination Certificate

active

07602537

ABSTRACT:
Gamut-mapping from a source device to a destination device is performed in a perceptually linear color space such as CIECAM02 by separating a source image into primary color components and processing each primary component separately by mapping a source primary hue leaf with a destination primary hue leaf. The mapped primary components are then summed and a resultant destination image is obtained. Alternatively, hue rotation is performed by determining a relative position of an input color between the nearest primary and the nearest secondary color in a source hue wheel. The determined relative position in the source hue wheel is used to find a corresponding location in a destination hue wheel so that the hue angle for obtaining the destination hue leaf can be determined. In both processes, the source and destination hue leafs are mapped using a cusp-to-cusp mapping with a shear mapping process being used to pull in the remaining colors. Finally, results of the mapping process are converted from device-independent color appearance space values to tristimulus values, and from tristimulus values to a color space of the destination device.

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