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Article Number A03182002
What is meant by dithering?
Dithering (not to be confused with "showing flustered excitement or fear") comes into play with
images being reduced to 256 colors or less. It's a method of approximating colors outside the actual
image palette-for example, by alternating pixels of red and blue from within the palette to produce the visual
impression of a purple color that's not in the palette. Applications (including Web browsers) can use dithering in
256-color mode if the images being displayed include colors outside the application palette. This can
degrade solid-color areas and is one of the main reasons to export 256-color Web-bound images using the so-called
Web-safe palette.
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