Canvas (Atari)

Canvas is a graphics application for Atari ST computers. It has several associated graphics file formats, including:
 * Compact Picture Format (.CPT)
 * Compact Picture Format Hue Balance info? (.HBL)
 * FullPic Picture Format (.FUL)
 * Canvas Picture Format (.CNV)
 * IMG Picture Format (.IMG)
 * Palette Format (.PAL)

can be converted on their own. If a corresponding .hbl file is present, then additional information in the .hbl file produces a picture with better colors.

Specifications

 * Canvas v1.17 manual, "File Formats" section

Software

 * Konvertor
 * RECOIL (.CPT format)
 * Canvas v1.17

Sample files

 * http://cd.textfiles.com/crawlycrypt1/graphics/canvas17/_picture/
 * https://telparia.com/fileFormatSamples/image/canvas/