PNG(5)                                                     PNG(5)



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(3), zlib(3), deflate(5), and zlib(5)

       PNG specification (second edition), November 2003:

                PNG(5)