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(3),zlib(3),deflate(5),andzlib(5)

       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


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


Man(1) output converted with man2html