Gifpress

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File Format
Name Gifpress
Ontology
Extension(s) .gps
Released 1994

Gifpress is a special-purpose file compression utility for DOS. It compresses only GIF image files, to its native .GPS format. It was developed by John Callicotte, and distributed as shareware.

A GPS file can be decompressed back to a GIF file that is functionally identical to the original, but not necessarily byte-for-byte identical.

Format details

There's clear evidence that Gifpress uses the Cx data compression toolkit (v2.01) by Eugene Nelson and Four Lakes Computing (cx201e.zip).

Identification

It's not known how to identify a GPS file from its contents, though in limited testing, the bytes 0xff 0xb4 always appeared at offset 2.

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