png(5)

PNG(5)                    FILE FORMATS                     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 ras-
     ter 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 heterogene-
     ous 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  Edi-
     tion)  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.

                   Last change: June 27, 2006                   1

PNG(5)                    FILE FORMATS                     PNG(5)

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

                   Last change: June 27, 2006                   2