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 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
       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 display option. PNG is robust, providing both full file integrity checking and fast, simple detection of com-
       mon 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), and zlib(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://ftp.rfc-editor.org:/in-notes/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 pro-
       cessing - 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  condi-
       tions of use and distribution.

                                                          July 9, 2011                                                    PNG(5)