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 stor-
       age   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 applica-
       tions, 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.


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) 1998-2004 Glenn  Randers-
       Pehrson.   See png.h for conditions of use and distribu-
       tion.

       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 Mas-
       sachusetts Institute of Technology.  See the  specifica-
       tion for conditions of use and distribution.





                        December 3, 2004                 PNG(5)
