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X11R7.4 - man page for png (x11r4 section 5)

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PNG(5)											   PNG(5)

       png - Portable Network Graphics (PNG) format

       PNG  (Portable  Network Graphics) 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. Sample depths range  from	1  to  16

       PNG  is	designed to work well in online 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 fast, simple detection of common transmission errors.
       Also, PNG can store gamma and chromaticity data for improved color matching  on	heteroge-
       neous platforms.

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

       PNG specification (second edition), November 2003:

		<http://www.w3.org/TR/2003/REC-PNG-20031110/ PNG 1.2 specification, July 1999:


       PNG 1.0 specification, October 1996:

	      RFC 2083

	      or (as a W3C Recommendation) at

       This man page: Glenn Randers-Pehrson

       Portable  Network  Graphics  (PNG) Specification (Second Edition) Information technology -
       Computer graphics and image processing - Portable Network Graphics (PNG): Functional spec-
       ification.  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).

       This  man page is 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 specifica-
       tion 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.

					February 14, 2009				   PNG(5)
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