PNG(5)PNG(5)NAME
png - Portable Network Graphics (PNG) format
DESCRIPTIONPNG (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 ALSOlibpng(3),zlib(3),deflate(5),andzlib(5)PNG 1.2 specification, July 1999:
http://www.cdrom.com/pub/png (moving to
http://www.libpng.org)
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
March 21, 2000 1
PNG(5)PNG(5)
Randers-Pehrson. See the specification for conditions of
use and distribution.
The PNG-1.0 specification is copyright (c) 1996 Massachus-
sets Institute of Technology. See the specification for
conditions of use and distribution.
March 21, 2000 2