ColoRIX compressed 16-color format

This is a follow-up to my previous post on ColoRIX compressed 256-color images. Here I'll explain how to decode (at least some) compressed 16-color images. The short answer: The compression for 16-color images is the same as for 256-color images, except that the "XOR filter" step doesn't happen. The documentation for "RIX3" format (or "new" …

ColoRIX compressed image format

[Update: See also the follow-up post about the 16-color format.] There's an old DOS program named ColoRIX VGA Paint. It was developed by RIX Softworks in the 1980s. Its native graphics file format, which I'll call "RIX" format or "ColoRIX" format, can be read by a fair number of old DOS graphics utilities, and even …