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From: =?ISO-8859-1?Q?Niels_Fr=F6hling?= <spamtrap@adsignum.com>
Newsgroups: comp.compression
Subject: Re: Trinary image compression
Date: Mon, 22 Oct 2012 20:41:07 -0600
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Xref: csiph.com comp.compression:1559

> Yes, that is fine. But there are no standard compression algorithms,
> more specifically, no popular decompression algorithms, that do it.

There are a lot of papers about palette-based compression. Most of the research 
beats JBIG by a margin in it's own territory, b/w in the end is just a two-color 
palette.
In your three color case, if you have no better inspiration, just code two 
planes (a: is it color 0 or the others?, b: is it colour 1 or the others?, c: is 
implicit).

Ciao
   Niels