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png

PNG(5)								File Formats Manual							    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 common 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 checking 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 specification, 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) Information 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) 1998-2006 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.

								   June 26, 2010							    PNG(5)