1PNG(5)                        File Formats Manual                       PNG(5)
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NAME

6       png - Portable Network Graphics (PNG) format
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DESCRIPTION

9       PNG  (Portable  Network  Graphics) is an extensible file format for the
10       lossless, portable, well-compressed storage of raster images. PNG  pro‐
11       vides  a patent-free replacement for GIF and can also replace many com‐
12       mon uses of TIFF. Indexed-color, grayscale, and  truecolor  images  are
13       supported,  plus  an optional alpha channel. Sample depths range from 1
14       to 16 bits.
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16       PNG is designed to work well in online viewing  applications,  such  as
17       the  World  Wide Web, so it is fully streamable with a progressive dis‐
18       play option. PNG is robust, providing both full file integrity checking
19       and fast, simple detection of common transmission errors. Also, PNG can
20       store gamma and chromaticity data for improved color matching  on  het‐
21       erogeneous platforms.
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SEE ALSO

25       libpng(3), zlib(3), deflate(5), and zlib(5)
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27       PNG specification (second edition), November 2003:
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29                <http://www.w3.org/TR/2003/REC-PNG-20031110/  PNG 1.2 specifi‐
30              cation, July 1999:
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32              http://www.libpng.org/pub/png
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34       PNG 1.0 specification, October 1996:
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36              RFC 2083
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38              ftp://ftp.rfc-editor.org:/in-notes/rfc2083.txt
39              or (as a W3C Recommendation) at
40              http://www.w3.org/TR/REC-png.html
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AUTHORS

43       This man page: Glenn Randers-Pehrson
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45       Portable Network Graphics (PNG) Specification (Second Edition) Informa‐
46       tion  technology  -  Computer  graphics and image processing - Portable
47       Network Graphics (PNG): Functional specification.   ISO/IEC  15948:2003
48       (E) (November 10, 2003): David Duce and others.
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50       Portable  Network  Graphics  (PNG)  Specification  Version 1.2 (July 8,
51       1999): Glenn Randers-Pehrson and others (png-list).
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53       Portable Network Graphics (PNG) Specification Version 1.0  (October  1,
54       1996): Thomas Boutell and others (png-list).
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57       This  man  page  is Copyright (c) 1998-2006 Glenn Randers-Pehrson.  See
58       png.h for conditions of use and distribution.
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60       The PNG Specification (Second Edition) is Copyright (c) 2003 W3C. (MIT,
61       ERCIM, Keio), All Rights Reserved.
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63       The  PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.
64       See the specification for conditions of use and distribution.
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66       The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute
67       of Technology.  See the specification for conditions of use and distri‐
68       bution.
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70                                  May 8, 2008                           PNG(5)
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