PNG(5)                                                     PNG(5)

       png - Portable Network Graphics (PNG) format

       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.


       PNG specification: RFC 2083

              or (as a W3C Recommendation) at

       This man page: Glenn Randers-Pehrson

       Portable  Network Graphics (PNG) Specification Version 1.0
       (October  1,  1996):  Thomas  Boutell  and  others   (png-

       The  PNG specification is copyright (c) 1996 Massachussets
       Institute of Technology.  See the specification for condi-
       tions of use and distribution.

                         January 14, 1999                       1