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Portable Network Graphics (PNG)
"PNG (pronounced 'ping') is ... a format for storing bitmapped (raster) images on computers." The website for this open-source image format is organized into four basic categories of information: general information; supporting applications (browsers, image editors, etc.); programming resources (libraries, toolkits, source code); and images (examples and a large list of links to related resources).
http://www.libpng.org/pub/png/

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