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PNG(5)									PNG(5)


NAME

       png - Portable Network Graphics (PNG) format


DESCRIPTION

       PNG  (Portable  Network	Graphics) is an extensible file format for the
       lossless, portable, well-compressed storage of raster images.  PNG pro-
       vides a patent-free replacement for GIF, and can also replace many com-
       mon uses of TIFF. Indexed-color, grayscale, and	truecolor  images  are
       supported,  plus an optional alpha channel.  Sample depths range from 1
       to 16 bits.
       PNG is designed to work well in online viewing  applications,  such  as
       the  World  Wide Web, so it is fully streamable with a progressive dis-
       play option.  PNG is robust, providing both full file integrity	check-
       ing  and  fast,	simple detection of common transmission errors.  Also,
       PNG can store gamma and chromaticity data for improved  color  matching
       on heterogeneous platforms.


SEE ALSO

       libpng(3), libpngpf(3), zlib(3), deflate(5), and zlib(5)

       PNG Specification (Second Edition), November 2003:

	      https://www.w3.org/TR/2003/REC-PNG-20031110/

       PNG 1.2 Specification, July 1999:

	      https://png-mng.sourceforge.io/pub/png/spec/1.2/

       PNG 1.0 Specification, October 1996:

	      RFC 2083
	      https://www.ietf.org/rfc/rfc2083.txt

	      or W3C Recommendation
	      https://www.w3.org/TR/REC-png-961001


AUTHORS

       This man page: Cosmin Truta, Glenn Randers-Pehrson

       Portable Network Graphics (PNG) Specification (Second Edition) Informa-
       tion technology - Computer graphics and	image  processing  -  Portable
       Network	Graphics  (PNG): Functional specification.  ISO/IEC 15948:2003
       (E) (November 10, 2003): David Duce and others.

       Portable Network Graphics (PNG)	Specification  Version	1.2  (July  8,
       1999): Glenn Randers-Pehrson and others (png-list).

       Portable  Network  Graphics (PNG) Specification Version 1.0 (October 1,
       1996): Thomas Boutell and others (png-list).


COPYRIGHT

       This man page is
       Copyright (c) 2018 Cosmin Truta.
       Copyright (c) 1998-2006 Glenn Randers-Pehrson.
       See png.h for conditions of use and distribution.

       The PNG Specification (Second Edition) is
       Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.

       The PNG-1.2 Specification is
       Copyright (c) 1999 Glenn Randers-Pehrson.
       See the specification for conditions of use and distribution.

       The PNG-1.0 Specification is
       Copyright (c) 1996 Massachusetts Institute of Technology.
       See the specification for conditions of use and distribution.

			       December 1, 2018 			PNG(5)

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