File Formats                                             png.4(4)



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 TIF. Indexed-
     color, grayscale, and truecolor images are supported, and 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, and is fully streamable with a
     progressive display option.  PNG  is  robust,  and  provides
     both full file integrity checking, and fast simple detection
     of common transmission  errors.  PNG  can  store  gamma  and
     chromaticity data for improved color matching on heterogene-
     ous platforms.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Availability                 SUNWpng                     
    
     Interface stability          Volatile                    
    


SEE ALSO
     libpng(3), zlib(3)

     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 Recommen-
     dation at http:/www.w3.org/TR/REC-png.html

NOTES
     This man page  was  originally  written  by  Glenn  Randers-
     Pehrson.  Updated  by Breda McColgan, Sun Microsystems Inc.,
     2004.







SunOS 5.11          Last change: 26 Mar 2004                    1