png - Portable Network Graphics (PNG) format
DESCRIPTION
PNG (Portable Network Graphics) is an extensible file for
mat 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 sup
ported, plus an optional alpha channel. Sample depths
range from 1 to 16 bits.
PNG is designed to work well in online viewing applica
tions, such as the World Wide Web, so it is fully stream
able with a progressive display option. PNG is robust,
providing both full file integrity checking and fast, sim
ple 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 1.2 specification, July 1999:
http://www.libpng.org/pub/png
or ftp://ftp.uu.net/graphics/png/documents
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 Version 1.2
(July 8, 1999): Glenn Randers-Pehrson and others (png-
list@ccrc.wustl.edu).
Portable Network Graphics (PNG) Specification Version 1.0
(October 1, 1996): Thomas Boutell and others (png-
list@ccrc.wustl.edu).
COPYRIGHT NOTICE
The PNG-1.2 specification is copyright (c) 1999 Glenn Ran
ders-Pehrson. See the specification for conditions of use
The PNG-1.0 specification is copyright (c) 1996 Massachus
sets Institute of Technology. See the specification for
conditions of use and distribution.
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