Rendition, Inc.

Thomas J Repa

Glenn C Poole

A circuit in a graphics processing subsystem receives pixel color values as input and concurrently provides both dithering and scale correction of the color values. Pixel color values are initially generated by the subsystem as 8-bit binary quantities, each having a maximum possible value of 255. However, the graphics processing subsystem utilizes a scale of 0 to 256 for processing color values. The correction function prevents a loss of pixel intensity that would otherwise result from representing 8-bit color values on a 0 to 256 scale.

Concurrent dithering and scale correction of pixel color values

A method and apparatus for performing color space conversion using blend circuitry in a graphics/video adapter is provided. Blend circuitry which is capable of blending two color values and fog circuitry which is capable of adjusting color values based on a fog factor are used. A first stage of converting a color value from YC.sub.r C.sub.b (YUV) color space to RGB color space is performed using the fog circuitry, and a second stage of converting the color value from the YC.sub.r C.sub.b (YUV) color space to RGB color space is performed using the blend circuitry, resulting in the generation of a converted color value .

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San Carlos, CA, United States of America

Thomas J Repa