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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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quant.hlp
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1994-08-01
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@C1@c@b@_ Quantization
To reduce the number of colors in an image.
@s@b Note
It is not recommended to use quantization for the purpose of saving
disk space because JPEG is better at that and retains more info than
quantization as well.
Several Quantization method exists
@b Fast256
An effective and relatively accurate quantization implementation.
However, accuracy for reducing colors to other than 256 colors
is unknown.
@b median cut
The most popular and accurate one. It takes more CPU time however.
(in this pre-release, this method is not implemented. General
purpose quantization can still be achieved thru external bindings
to djpeg or ppmquant. See sample bindings).
@b Octree
A simple and fast method which gives acceptable results for most
images.
@b Bugs
Only Fast256 is implemented in this pre-release.