 anim is a file format, used to store digital movies and computer generated animations (hence the anim name), and is a variation of the ilbm format, which is a subformat of interchange file format. ==main features== ===anim filetypes=== known filetypes for anim into amigaos are: anim1, anim2, anim3, anim5 and anim7. anim1 to anim3 did not support audio. anim 5 and anim7 should be able to contain audio data and being a complete movie animation file format.  ===additions to iff standard=== in addition to the normal ilbm chunks, anim filetype also defines: * anhd (animation header) * dlta - stores changes between frames, with various compression methods supported to make use of the redundancy between frames. compression modes: * anim-0 ilbm body (no delta compression) * anim-1 ilbm xor * anim-2 long delta mode * anim-3 short delta mode * anim-4 general delta mode * anim-5 byte vertical delta mode (most common) * anim-6 stereo byte delta mode (stereoscopic frames) * anim-7 anim-5 compression using long/word data * anim-8 anim-5 compression using long/word data * anim-j eric grahams compression format (sculpt 3d / sculpt 4d) it is possible to have several compression modes inside a file. ==history== the anim iff format was developed in 1988 at sparta inc., a firm based in california, originally for the production of animated video sequences on the amiga computer, and was used for the first time in aegis videoscape and video titler programs for the amiga line of computers. as being very efficient and also being an official subset of existing amiga ilbm/iff standard file format, it became the de facto standard for any animation file on amiga. the file format must had these characteristics: *be able to store, and play back, sequences of frames and to minimize both the storage space on disk (through compression) and playback time (through efficient de-compression algorithms). *maintain maximum compatibility with existing iff formats and to be able to display the initial frame as a normal still iff picture. several compression schemes have been introduced in the anim format. most of these are strictly of historical interest as the only one currently used is the vertical run length encoded byte encoding developed by atari software programmer jim kent. amiga anim7 format was created in 1992 by programmer wolfgang hofer. the fileformat used by cdtv and amiga cd32, was called cdxl and were nothing than anim files with another name. cd32 supported mainly anim7. ==technical overview== minimum anim file consists of three ilbm interleaved bitmap images. the first bitmap is necessary for the creation of the "next" frame and the two more for the "history" in order to create the "delta" images calculated as differences from the first one.
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