Graphics Processor

Graphics Processor is a file format for the Atari ST.

files are 16 colors and 320x200

files are 4 colors and 640x400

files are mono and 640x400

Identification
The test files I have located are all exactly 32331 bytes long. Not sure if this is always the case or not.

Software

 * RECOIL

Sample files

 * https://telparia.com/fileFormatSamples/image/graphicsProcessor/