PNG(5) File Formats Manual PNG(5)
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 raster images. PNG pro-
vides a patent-free replacement for GIF, and can also replace many com-
mon 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 dis-
play option. PNG is robust, providing both full file integrity check-
ing 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), libpngpf(3), zlib(3), deflate(5), and zlib(5)
PNG Specification (Second Edition), November 2003:
https://www.w3.org/TR/2003/REC-PNG-20031110/
PNG 1.2 Specification, July 1999:
https://png-mng.sourceforge.io/pub/png/spec/1.2/
PNG 1.0 Specification, October 1996:
RFC 2083
https://www.ietf.org/rfc/rfc2083.txt
or W3C Recommendation
https://www.w3.org/TR/REC-png-961001
AUTHORS
This man page: Glenn Randers-Pehrson, Cosmin Truta
Portable Network Graphics (PNG) Specification (Second Edition) Informa-
tion 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 others (png-list).
COPYRIGHT
This man page is
Copyright (c) 2018 Cosmin Truta.
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 specification for conditions of use and distribution.
September 14, 2022 PNG(5)
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