Apple Icon Image Format
Lambert M. Surhone, Mariam T. Tennoe, Susan F. Henssonow
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The Apple Icon Image format is the icon format used in Apple Inc.'s Mac OS X. It supports icons of 16x16, 32x32, 48x48, 128x128, 256x256 and 512x512 pixels, with both 1- and 8-bit alpha channels 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.
