Smoothly changing gray levels in color transforms

Details Smoothly changing gray levels in color transforms Smoothly changing gray levels in color transforms

2008-01-15

2010-12-28

Rogers, Scott A (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S518000, C358S521000, C358S523000

Reexamination Certificate

active

07859721

ABSTRACT:
Systems and methods, including computer software products, for processing gray colors in a conversion between color spaces involve identifying a non-pure gray color value in a color space that represents a substantially gray color. The methods further include converting the non-pure gray color value to a corresponding pure gray color value in the color space. The methods also include determining a first difference vector between the non-pure gray color value and the corresponding pure gray color value. The methods further include determining a distance between the corresponding pure gray color value and a selected color value. The corresponding pure gray color value represents a nearest pure gray color value to the selected color value. The methods also includes determining a correction factor based on the first difference vector and the distance and applying the correction factor to the selected color value to produce a corrected color value.

REFERENCES:
patent: 6137594 (2000-10-01), Decker et al.
patent: 6919972 (2005-07-01), Kumada et al.
patent: 7312893 (2007-12-01), Bestmann et al.
patent: 7679783 (2010-03-01), Pellar
patent: 2006/0170993 (2006-08-01), Jacob

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