PNG(G)                                                     PNG(G)



NAME
       png - Portable Network Graphics (PNG) format

DESCRIPTION
       PNG (Portable Network Graphics) is an extensible file for-
       mat 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 sup-
       ported, 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  stream-
       able  with  a  progressive  display option. PNG is robust,
       providing both full file integrity checking and fast, sim-
       ple detection of common transmission errors. Also, PNG can
       store gamma  and  chromaticity  data  for  improved  color
       matching on heterogeneous platforms.


SEE ALSO
       libpng(g), zlib(b), deflate(e), and zlib(b).

       PNG 1.2 specification, July 1999:

              http://www.libpng.org/pub/png
              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 Ran-
       ders-Pehrson.  See the specification for conditions of use
       and distribution.

       The PNG-1.0 specification is copyright (c) 1996 Massachus-
       sets Institute of Technology.  See the  specification  for
       conditions of use and distribution.





                           June 8, 2001                    PNG(G)