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portable network graphics : FOLDOC | Portable Network Graphics /ping/ (PNG) 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-colour}, grey-scale and true colour images are supported, plus an optional {alpha channel}. Sample depths range from 1 to 16 bits. PNG is designed for on-line viewing applications, such as the World-Wide Web, so it is fully {streamable} with a {progressive display} option. PNG is robust, providing both full file integrity checking and simple detection of common transmission errors. Also, PNG can store gamma correction and {chromaticity} data for improved colour matching on heterogeneous platforms. Filename extension: .png. {RFC 2083}. {W3C PNG pages (http://w3.org/Graphics/PNG/)}. {PNG home page (http://wco.com/~png/)}. (1997-08-07)
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