ILBM

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"ILBM" IFF Interleaved Bitmap

Filename extension	.iff, .lbm
Internet media type	image/x-ilbm
Developed by	Electronic Arts
Initial release	14 January 1985 (39 years ago) (1985-01-14)
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]}