December 2012
Intermediate to advanced
631 pages
13h 10m
English
Content preview from Graphics Gems III (IBM Version)
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1.4
A SIMPLE COLOR REDUCTION FILTER
Dennis Bragg, Graphics Software, Inc., Bullard, Texas
Publisher Summary
This chapter describes a simple filter that reduces a 24-bit color raster image to 15 significant bits and eliminates the problem of visible color stepping. The resulting image can be displayed directly on a 16-bit frame buffer or used as input to a color-quantization method for further reduction in the number of colors in the image. Raster images are often stored as an array of 24-bit pixels with 8 bits allocated to each red, green, or blue (RGB) component. Each RGB component holds one of 256 possible intensity levels. Frame buffers that can display 24-bit color images are not always readily available. Color displays that use 8-bit ...
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