Apple Icon Image format

Apple Icon Image Format

File Format
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Apple Icon Image format

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Description:
The Apple Icon Image format is the icon format used in Apple Inc.'s Mac OS X. It supports icons of 16×16, 32×32, 48×48, 128×128, 256×256 and 512×512 pixels, with both 1- and 8-bit alpha channel and multiple image states (example: open and closed folders). The fixed-size icons can be scaled by the operating system and displayed at any intermediate size.

File structure

The file format consists of an 8 byte header, followed by any number of icons.

Header



Icon data



Compression

Over the time the format have been improved and there is support for compression of some parts of the pixel data. The 32-bit ("is32", "il32", "ih32","it32") pixel data is offen compressed (per channel) with the PackBits algorithm.<br/>Some sources mentioned that the OS supports both compressed or uncompressed data chunks.

Icon types

  • the values inside the brakets () in the length column is the uncompressed length.


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