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PNG(5)                                                                                                PNG(5)



NAME
       png - Portable Network Graphics (PNG) format

DESCRIPTION
       PNG  (Portable  Network  Graphics) is an extensible file format for the lossless, portable, well-com-pressed well-compressed
       pressed 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 supported, plus 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,  so  it  is
       fully streamable with a progressive display option. PNG is robust, providing both full file integrity
       checking and fast, simple 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:

                <http://www.w3.org/TR/2003/REC-PNG-20031110/ PNG 1.2 specification, July 1999:

              http://www.libpng.org/pub/png

       PNG 1.0 specification, October 1996:

              RFC 2083

              ftp://ftp.rfc-editor.org:/in-notes/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  (Second Edition) Information technology - Computer
       graphics and image processing - Portable Network Graphics (PNG): Functional  specification.   ISO/IEC
       15948:2003 (E) (November 10, 2003): David Duce and others.

       Portable  Network  Graphics (PNG) Specification Version 1.2 (July 8, 1999): Glenn Randers-Pehrson and
       others (png-list).

       Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996): Thomas Boutell and  oth-
       ers (png-list).




COPYRIGHT NOTICE
       This  man page is Copyright (c) 1998-2006 Glenn Randers-Pehrson.  See png.h for conditions of use and
       distribution.

       The PNG Specification (Second Edition) is Copyright (c) 2003 W3C.  (MIT,  ERCIM,  Keio),  All  Rights
       Reserved.

       The  PNG-1.2  specification  is  copyright (c) 1999 Glenn Randers-Pehrson.  See the specification for
       conditions of use and distribution.

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





                                              December 3, 2009                                        PNG(5)

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