Portable Network Graphics format. A versatile image compression format which is not as widely supported by browsers as GIF or JPEG.
Portable Network Graphics"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." (Quote from W3C site)
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