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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-compressed 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. Sam-
ple 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),andzlib(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://ds.internic.net/rfc/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 technol-
ogy - 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 NOTICE
This man page is Copyright (c) 1998-2004 Glenn Randers-Pehrson. See png.h for con-
ditions 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 Technol-
ogy. See the specification for conditions of use and distribution.
December 3, 2004 PNG(5)
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