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       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
       heterogeneous platforms.


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

       PNG specification (second edition), November 2003:

                < 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
       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).


       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.

                                           July 9, 2011                                    PNG(5)