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
11400549
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.
REFERENCES:
patent: 5611030 (1997-03-01), Stokes
patent: 7127102 (2006-10-01), Hiramatsu et al.
patent: 7177645 (2007-02-01), Goldhamer
patent: 2005/0047648 (2005-03-01), Newman et al.
patent: 2005/0047654 (2005-03-01), Newman et al.
patent: 2006/0119870 (2006-06-01), Ho et al.
patent: 2007/0052719 (2007-03-01), Tin
patent: 2007/0085855 (2007-04-01), Tin
U.S. Appl. No. 09/443,796, Newman et al., pending.
LandOfFree
Black enhancement in perceptual gamut mapping does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Black enhancement in perceptual gamut mapping, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Black enhancement in perceptual gamut mapping will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3952878