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

6       png - Portable Network Graphics (PNG) format
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DESCRIPTION

10       PNG  (Portable  Network  Graphics) is an extensible file format for the
11       lossless, portable, well-compressed storage of raster images.  PNG pro‐
12       vides a patent-free replacement for GIF, and can also replace many com‐
13       mon uses of TIFF. Indexed-color, grayscale, and  truecolor  images  are
14       supported,  plus an optional alpha channel.  Sample depths range from 1
15       to 16 bits.
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  check‐
19       ing  and  fast,  simple detection of common transmission errors.  Also,
20       PNG can store gamma and chromaticity data for improved  color  matching
21       on heterogeneous platforms.
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SEE ALSO

25       libpng(3), libpngpf(3), zlib(3), deflate(5), and zlib(5)
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27       PNG Specification (Second Edition), November 2003:
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29              https://www.w3.org/TR/2003/REC-PNG-20031110/
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31       PNG 1.2 Specification, July 1999:
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33              https://png-mng.sourceforge.io/pub/png/spec/1.2/
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35       PNG 1.0 Specification, October 1996:
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37              RFC 2083
38              https://www.ietf.org/rfc/rfc2083.txt
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40              or W3C Recommendation
41              https://www.w3.org/TR/REC-png-961001
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AUTHORS

45       This man page: Cosmin Truta, Glenn Randers-Pehrson
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47       Portable Network Graphics (PNG) Specification (Second Edition) Informa‐
48       tion technology - Computer graphics and  image  processing  -  Portable
49       Network  Graphics  (PNG): Functional specification.  ISO/IEC 15948:2003
50       (E) (November 10, 2003): David Duce and others.
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52       Portable Network Graphics (PNG)  Specification  Version  1.2  (July  8,
53       1999): Glenn Randers-Pehrson and others (png-list).
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55       Portable  Network  Graphics (PNG) Specification Version 1.0 (October 1,
56       1996): Thomas Boutell and others (png-list).
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60       This man page is
61       Copyright (c) 2018-2019 Cosmin Truta.
62       Copyright (c) 1998-2006 Glenn Randers-Pehrson.
63       See png.h for conditions of use and distribution.
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65       The PNG Specification (Second Edition) is
66       Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.
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68       The PNG-1.2 Specification is
69       Copyright (c) 1999 Glenn Randers-Pehrson.
70       See the specification for conditions of use and distribution.
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72       The PNG-1.0 Specification is
73       Copyright (c) 1996 Massachusetts Institute of Technology.
74       See the specification for conditions of use and distribution.
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78                                April 14, 2019                          PNG(5)
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