Method and apparatus for mapping colors in an image through dithering and diffusion
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United States of America Patent
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Oct 3, 1995
Issued Date -
N/A
app pub date -
May 27, 1993
filing date -
Dec 23, 1992
priority date (Note) -
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Abstract
A high color resolution image is accurately approximated with a low resolution image through a unique combination of ordered dithering and error diffusion. The true color of each pixel is modified with error from previously rendered pixels and then dithered to an intermediate color of 15 bits. The intermediate color is then mapped to the nearest displayable color in a displayable color palette using a precomputed look-up table. Any error between a displayed color of a pixel and its true color is calculated and spread among neighboring pixels not yet rendered.
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