Gamut mapping with saturation intent

Details Gamut mapping with saturation intent Gamut mapping with saturation intent

2006-04-07

2009-11-24

Haskins, Twyler L (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S002100, C358S518000, C382S162000, C345S589000

Reexamination Certificate

active

07623266

ABSTRACT:
Techniques for use in gamut mapping processes are presented, including a method for mapping cusp points using hue wheels to obtain a source relative hue angle, and interpolating a lightness value at the source point hue. A maximum chroma value is determined at the source hue and the interpolated lightness, thus defining a source primary cusp point. A primary cusp point for a second color gamut is similarly obtained, and the source primary cusp point is mapped to the destination primary cusp point using a shear mapping technique. Another technique includes performing lightness compression by applying a chroma dependency factor and either a first or second factor, depending on a comparison of a lightness values of a destination point and a second point. Another technique involves performing chroma expansion by comparing chroma extents of source and destination points, and adjusting the chroma of the destination point based on the comparison.

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