png

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),zlib(3),deflate(5),andzlib(5)

       PNG specification (second edition), November 2003:

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

	      http://www.libpng.org/pub/png

       PNG 1.0 specification, October 1996:

	      RFC 2083

	      ftp://ds.internic.net/rfc/rfc2083.txt
	      or (as a W3C Recommendation) at
	      http://www.w3.org/TR/REC-png.html

AUTHORS
       This man page: Glenn Randers-Pehrson

       Portable Network Graphics (PNG) Specification (Second Edition)  Infor-
       mation  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 NOTICE
       This  man  page is Copyright (c) 1998-2004 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  Insti-
       tute  of	 Technology.  See the specification for conditions of use and
       distribution.





			      September 12, 2004		       PNG(5)