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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 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 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

                                 June 26, 2010