Table of Contents
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)
,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
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).
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
Massachussets Institute of Technology. See the specification for conditions
of use and distribution.