PNG

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See also: Graphic Formats

Acronym: Portable Network Graphics

Home Page: http://www.w3.org/Graphics/PNG/

From the w3.org PNG Homepage:

PNG is an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel for transparency. Sample depths range from 1 to 16 bits.