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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
Portable Network Graphics
PNG
/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, greyscale and truecolour 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)