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| Filename extension | .iff, .lbm |
|---|---|
| Internet media type | image/x-ilbm |
| Developed by | Electronic Arts |
| Initial release | 14 January 1985 |
| Type of format | Image file formats |
| Contained by | Interchange File Format |
| Standard | EA IFF 85: Standard for Interchange Format[1][2][3] |
| Open format? | Public domain source code |
Interleaved Bitmap (ILBM) is an image file format conforming to the Interchange File Format (IFF) standard. The format originated on the Amiga platform, and on IBM-compatible systems, files in this format or the related PBM (Planar Bitmap) format are typically encountered in games from late 1980s and early 1990s that were either Amiga ports or had their graphical assets designed on Amiga machines.[citation needed]
A characteristic feature of the format is that it stores bitmaps in the form of interleaved bit planes, which gives the format its name; this reflects the way the Amiga graphics hardware natively reads graphics data from memory. Packbits, a simple form of compression is supported to make ILBM files more compact.[4]
On the Amiga, these files are not associated with a particular file extension, though as they started being used on PC systems where extensions are systematically used, they employed a .lbm or occasionally a .pbm extension.[citation needed]
- ^ Jerry Morrison (1985-01-14). "EA IFF 85: Standard for Interchange Format Files". Electronic Arts. Retrieved 2014-03-06.
- ^ Jerry Morrison (1986-01-17). ""ILBM" IFF Interleaved Bitmap". Electronic Arts. Archived from the original on 2014-06-13. Retrieved 2014-03-06.
- ^ James D. Murray; William vanRyper (April 1996). Encyclopedia of Graphics File Formats, Second Edition. O'Reilly. ISBN 1-56592-161-5. Retrieved 2014-02-27.
- ^ "ILBM IFF Interleaved Bitmap". 8 June 2012. Retrieved 2018-07-30.