StuffIt Image Format

StuffIt Image Format (SIF) is a special-purpose compression scheme that adds additional lossless compression to JPEG files. It can reportedly be used in StuffIt X format.

There was a plan to make a standalone file format based on it, but that doesn't seem to have happened.

Links

 * StuffIt
 * Announcement (from archive.org)
 * NewScientist article (from archive.org)