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1.TH PNG 5 "April 14, 2019"
2.SH NAME
3png \- Portable Network Graphics (PNG) format
4
5.SH DESCRIPTION
6PNG (Portable Network Graphics) is an extensible file format for the
7lossless, portable, well-compressed storage of raster images. PNG
8provides a patent-free replacement for GIF, and can also replace many
9common uses of TIFF. Indexed-color, grayscale, and truecolor images are
10supported, plus an optional alpha channel. Sample depths range from
111 to 16 bits.
12.br
13PNG is designed to work well in online viewing applications, such
14as the World Wide Web, so it is fully streamable with a progressive
15display option. PNG is robust, providing both full file integrity
16checking and fast, simple detection of common transmission errors.
17Also, PNG can store gamma and chromaticity data for improved color
18matching on heterogeneous platforms.
19
20.SH "SEE ALSO"
21.BR "libpng"(3), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
22.LP
23PNG Specification (Second Edition), November 2003:
24.IP
25.br
26https://www.w3.org/TR/2003/REC-PNG-20031110/
27.LP
28PNG 1.2 Specification, July 1999:
29.IP
30.br
31https://png-mng.sourceforge.io/pub/png/spec/1.2/
32.LP
33PNG 1.0 Specification, October 1996:
34.IP
35.br
36RFC 2083
37.br
38https://www.ietf.org/rfc/rfc2083.txt
39.IP
40.br
41or W3C Recommendation
42.br
43https://www.w3.org/TR/REC-png-961001
44
45.SH AUTHORS
46This man page: Cosmin Truta, Glenn Randers-Pehrson
47.LP
48Portable Network Graphics (PNG) Specification (Second Edition)
49Information technology - Computer graphics and image processing -
50Portable Network Graphics (PNG): Functional specification.
51ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others.
52.LP
53Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
54Glenn Randers-Pehrson and others (png-list).
55.LP
56Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
57Thomas Boutell and others (png-list).
58
59.SH COPYRIGHT
60.LP
61This man page is
62.br
63Copyright (c) 2018-2019 Cosmin Truta.
64.br
65Copyright (c) 1998-2006 Glenn Randers-Pehrson.
66.br
67See png.h for conditions of use and distribution.
68.LP
69The PNG Specification (Second Edition) is
70.br
71Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.
72.LP
73The PNG-1.2 Specification is
74.br
75Copyright (c) 1999 Glenn Randers-Pehrson.
76.br
77See the specification for conditions of use and distribution.
78.LP
79The PNG-1.0 Specification is
80.br
81Copyright (c) 1996 Massachusetts Institute of Technology.
82.br
83See the specification for conditions of use and distribution.
84.\" end of man page
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