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png - Portable Network Graphics (PNG) format
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. 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
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.
libpng(3), zlib(3), deflate(5), and zlib(5)
PNG specification (second edition), November 2003:
<http://www.w3.org/TR/2003/REC-PNG-20031110/ PNG 1.2
specification, July 1999:
PNG 1.0 specification, October 1996:
or (as a W3C Recommendation) at
This man page: Glenn Randers-Pehrson
Portable Network Graphics (PNG) Specification (Second Edition)
Information 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).
This man page is 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
July 9, 2011 PNG(5)