In addition, the ICNS file supports 1-bit as well as 8-bit alpha channels. This format is pretty handy as a base for the ICNS since it allows transparency. ![]() The content of the ICNS file typically consists of one or more images in the PNG format. However, PNG was designed for transferring images on the Internet, not for professional-quality print graphics, and therefore does not support non-RGB color spaces such as CMYK. PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without alpha channel), and full-color non-palette-based RGB images (with or without alpha channel). As of OS X Mountain Lion, ICNS files can support even bigger images, namely the 1024x1024 pixels dimension. They range from 16x16 pixels to 512x512 pixels. ICNS files support images in a variety of dimensions. These icon files display a small image (icon) in the OSX Finder or dock, a representative for an application to which it is linked. Icon files used on Mac computers and other OS X devices use the file extension ICNS. ![]() However, PNG itself does not support animation at all. PNG was created as an improved, non-patented replacement for Graphics Interchange Format (GIF) and is the most used lossless image compression format on the Internet. ![]() Portable Network Graphics (PNG) is a raster graphics file format that supports lossless data compression.
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