NEOchrome Master

NEOchrome Master is an unofficial improved version of the NEOchrome graphics editor for Atari ST.

It apparently has at least two native file formats:
 * .NEO - An ILBM file with a "RAST" chunk (or chunk-like segment?).
 * .RST - Probably just contains color data, not an image.

Specifications

 * There is some information about the formats in the neochrom.txt file included with (at least some copies of) the NEOchrome Master software.
 * A copy at the

Software

 * RECOIL
 * NEOchrome Master
 * Dead Hackers Society: Pixel painters ...
 * Atari Mania page

Sample files

 * RECOIL formats → examples.zip → FISH.neo
 * https://telparia.com/fileFormatSamples/image/neochrome/

Links

 * NEOchrome - Also discusses NEOchrome Master.