Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2008-04-29
2008-04-29
Sajous, Wesner (Department: 2628)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S589000, C345S591000, C382S162000, C382S166000, C382S167000, C358S001900, C358S516000, C358S519000
Reexamination Certificate
active
07365755
ABSTRACT:
The present invention provides for gamut mapping between a source device and a destination device, the destination device having a destination device black point with a hue, and the source device and the destination device being respectively characterized by a source gamut shell and a destination gamut shell. A lightness compression is performed using the source gamut shell, the destination gamut shell and the destination device black point. A constant lightness transformation is performed, wherein the constant lightness transformation modifies the destination gamut shell so that a shell boundary of the destination gamut shell on the hue plane containing the destination device black point is shifted from an original position to align with a neutral axis of the destination gamut shell. A chroma compression is performed using the source gamut shell and the modified destination gamut shell. An inverse constant lightness transformation is performed to obtain mapped colors for the destination device, wherein the inverse constant lightness transformation returns the shell boundary to the original position. As such, dark, almost neutral colors can be produced with virtually the highest possible density for the destination device.
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U.S. Appl. No. 09/443,796, Newman et al., pending.
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Sajous Wesner
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