Iff/lbm Interchange Format Files

ReaConverter is a highly efficient LBM to GIF converter that makes it easy to convert millions of files. LBM is an interchange format, similar. Load LBM Files. Interchange File Format-Interleaved Bitmap (IFF-ILBM). LBM files use formatting similar to Portable Bitmap files. They may be black and white.

Name ILBM Ontology • • • ILBM Extension(s).iff,.lbm,.bbm,.ilbm,.pic, others PRONOM,, Released ≤1985 ILBM (or IFF-ILBM, or LBM) is a loosely-defined family of raster image file formats that use the container format. ILBM stands for InterLeaved BitMap. It is also sometimes called IFF or Amiga IFF, though IFF more properly refers to the generic format on which ILBM is based. As seems to be common practice, we consider ILBM to include some similar formats whose type identifier is not 'ILBM', and which are not necessarily interleaved. We exclude formats that use incompatible variants of IFF. ILBM files were widely used on Amiga computers, but are not limited to that platform. The format originated with the Deluxe Paint program from Electronic Arts.

Contents • • • • • • • • • • • • • • • • • • • • • • • Terminology Be aware that terms such as interleaved, planar, and contiguous are ambiguous. In ILBM jargon, they tend to mean the exact opposite of what they mean with respect to most other image formats. By most definitions of the terms, ILBM would ironically be considered to be planar, ACBM to be even more planar, and PBM to be contiguous. Notes When 'lost' computer graphics created by Andy Warhol on an Amiga computer were discovered and converted by retrocomputing buffs at the Carnegie Mellon University Computer Club in 2013, some of them were found to be in a slight variant of the ILBM format, with a.pic extension. Identification The file begins with the ASCII string FORM, and has a type identifier at offset 8 that is usually ILBM.

A BMHD chunk appears somewhere in the file, usually immediately after ILBM. Some variants formats have a 'FORM type' that is something other than ILBM, such as ' PBM ', ACBM, RGBN, or RGB8.

Format details Compression The image compression algorithm is indicated by a coded integer. The known compression types are 0 for no compression, 1 for, and 2 for a special 'vertical' RLE format (see VDAT, below).

Color cycling Some ILBM images are designed to be animated using palette color cycling, as indicated by CRNG chunks or other mechanisms. Many image viewers and converters don't support this feature. Aspect ratio Many ILBM images were designed for graphics modes having non-square pixels, so they will look squished if displayed directly on a modern computer. Fortunately, there is an 'aspect ratio' field (and sometimes other fields, such as a DPI chunk), which can supply the information needed to unsquish them.

Unfortunately, though this field is very often correct and useful, it is incorrect in a significant minority of files. For example, it may contain the reciprocal of the correct value, or it may be based on the shape of the image as a whole, instead of the shape of a pixel. There is probably no perfect solution to this problem. Palette precision Some viewers appear to display some ILBM images slightly too dark. For example, the whitest white may be (240,240,240) instead of (255,255,255).

This happens because, though the palette in an ILBM file always has 8 bits of precision per sample, some graphics modes did not use all 8. Encoders targeting such modes would sometimes carelessly set the low (usually 4) bits to zero. Some ILBM viewers try to detect this situation, and correct for it. Special types of ILBM The plain ILBM format is reasonably well standardized. This section describes some of the other ILBM formats.

Hold-and-Modify Hold-and-Modify ( HAM) images are designed to work with the Amiga's oddball Hold-and-Modify graphics modes. There are two main kinds of HAM images: HAM6 (6 bits per pixel) and HAM8 (8 bits per pixel).

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