Method and apparatus for generating color toning curves

Details Method and apparatus for generating color toning curves Method and apparatus for generating color toning curves

2006-01-09

2010-11-09

Tieu, Benny Q (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003240, C358S003270, C358S518000, C358S520000, C358S461000, C345S589000, C345S591000, C345S617000, C382S162000, C382S167000, C382S274000

Reexamination Certificate

active

07830548

ABSTRACT:
One embodiment of the present invention provides a system that generates a set of color-toning curves which can be used for color toning (or casting) a monochrome or color image. During operation, the system receives a first set of color-toning parameters for shadow regions, a second set of color-toning parameters for highlight regions, and an invariance property which needs to be maintained during color toning. The color-toning parameters specify the color that is to be applied to the shadows and highlights. Next, the system computes a set of color-toning-curve values and a set of color-toning-curve slopes using the first set of color-toning parameters, the second set of color-toning parameters, and the invariance property. The system then generates the set of color-toning curves using the set of color-toning-curve values and the set of color-toning-curve slopes. An important aspect of the present invention is that it can generate the color-toning curves simply based on the user specified color tones for the shadow and highlight regions.

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