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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 1.2 specification, July 1999:


          http://www.cdrom.com/pub/png         (moving         to
          http://www.libpng.org)
          or ftp://ftp.uu.net/graphics/png/documents

     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  Version  1.2
     (July  8,  1999):   Glenn  Randers-Pehrson  and others (png-
     list@ccrc.wustl.edu).

     Portable Network Graphics (PNG)  Specification  Version  1.0
     (October   1,   1996):   Thomas  Boutell  and  others  (png-
     list@ccrc.wustl.edu).

COPYRIGHT NOTICE
     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-
     sachussets  Institute  of Technology.  See the specification
     for conditions of use and distribution.

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