Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2011-06-07
2011-06-07
Caschera, Antonio A (Department: 2628)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S589000, C345S591000, C345S600000, C345S604000, C382S167000
Reexamination Certificate
active
07956868
ABSTRACT:
An improved gamut map model (GMM) useful in conjunction with Windows Color System (WCS). The method uses the WCS Minimum Color Difference (MinCD) GMM to handle gamut mapping for the Saturation rendering intent at low input chroma values. For input values to the gamut map model profile (GMMP), if the chroma value C falls within a predetermined chroma value range, the MinCD GMM will be applied, otherwise the Hue Mapping GMM is applied. The predetermined chroma value range can be determined by experimentation. The range is 0≦C≦10 in a preferred embodiment. This method will improve the gradation fidelity of the rendered images and reduce or prevent major hue shifts at low chroma values. The method may be implemented as a plug-in utility for a computer.
REFERENCES:
patent: 6388674 (2002-05-01), Ito et al.
patent: 6782127 (2004-08-01), Lee et al.
patent: 7623266 (2009-11-01), Sloan
patent: 2008/0007806 (2008-01-01), Shirasawa
WCS Gamut Map Model Profile Schema and Algorithms, http://msdn2.microsoft.com/en-us/library/ms536899.aspx, 46 pages, printed from the Internet on Sep. 21, 2007.
Caschera Antonio A
Chen Yoshimura LLP
Konica Minolta Systems Laboratory, Inc.
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