Glowicons
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The Glowicons format, based on NewIcons file format, is the icon format used in AmigaOS 3.5, 3.9 and 4.0 and MorphOS by Matt Chaput. The standard icon size is 46×46 pixels with maximum 256 (8-bit) colors and two image states (example: open and closed drawers). The second image state uses a glow effect to indicate that the icon is pressed.