ANIM форматы: Amiga анимациясы және оның даму тарихы

File format

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.

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, being a complete movie animation file format.

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 Development's Videoscape and Video Titler programs for the Amiga line of computers. The ANIM format is supported by at least one current online image editor.

Anim format allow five methods of compression: XOR mode, Long Delta mode, Short Delta mode, General Delta mode and Byte Vertical Compression.

Playback of ANIMs will usually require two buffers, as mentioned above, and double buffering between them. The frame data from the ANIM file is used to modify the hidden frame to the next frame to be shown. When using the XOR mode, the usual run length decoding routine can be easily modified to do the exclusive or operation required. Note that runs of zero bytes, which will be very common, can be ignored, as an exclusive or of any byte value to a byte of zero will not alter the original byte value. The general procedure, for all compression techniques, is to first decode the initial ILBM picture into the hidden buffer and double buffer it into view. Then this picture is copied to the other (now hidden) buffer. At this point each frame is displayed with the same procedure. The next frame is formed in the hidden buffer by applying the DLTA data (or the XOR data from the BODY chunk) and the new frame is double buffered into view. This process continues to the end of the file.

The Anim standard of Amiga influenced the development of Animated GIF format.