Alpha correction to compensate for lack of gamma correction

Details Alpha correction to compensate for lack of gamma correction Alpha correction to compensate for lack of gamma correction

2006-01-10

2006-01-10

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S590000, C345S592000, C345S597000, C345S629000

Reexamination Certificate

active

06985157

ABSTRACT:
The blending coefficients (alpha values) of font glyphs undergo alpha correction to compensate for a lack of gamma correction in text rendering processes. The alpha correction includes selecting a set of correction coefficients that correspond to the predetermined gamma value of the display device and computing corrected alpha values from the known alpha values, the foreground colors, and set of correction coefficients. The corrected alpha values can then be used to blend the foreground and background colors of the corresponding display pixels without requiring gamma correction. Accordingly, the alpha correction can be performed by a GPU, which is not configured to perform gamma correction, thereby increasing the speed at which text rendering can occur.

REFERENCES:
patent: 5128658 (1992-07-01), Pappas et al.
patent: 5473737 (1995-12-01), Harper
patent: 6897879 (2005-05-01), Lyapunov et al.
patent: 2005/0110804 (2005-05-01), Hancock et al.

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