1 .TH PNG 5 "October 3, 2002"
3 png \- Portable Network Graphics (PNG) format
5 PNG (Portable Network Graphics) is an extensible file format for the
6 lossless, portable, well-compressed storage of raster images. PNG provides
7 a patent-free replacement for GIF and can also replace many
8 common uses of TIFF. Indexed-color, grayscale, and truecolor images are
9 supported, plus an optional alpha channel. Sample depths range from
13 PNG is designed to work well in online viewing applications, such as the
14 World Wide Web, so it is fully streamable with a progressive display
15 option. PNG is robust, providing both full file integrity checking and
16 fast, simple detection of common transmission errors. Also, PNG can store
17 gamma and chromaticity data for improved color matching on heterogeneous
21 .IR libpng(3), zlib(3), deflate(5), and zlib(5)
23 PNG 1.2 specification, July 1999:
26 http://www.libpng.org/pub/png
28 or ftp://ftp.uu.net/graphics/png/documents
30 PNG 1.0 specification, October 1996:
36 ftp://ds.internic.net/rfc/rfc2083.txt
38 or (as a W3C Recommendation) at
40 http://www.w3.org/TR/REC-png.html
42 This man page: Glenn Randers-Pehrson
44 Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
45 Glenn Randers-Pehrson and others (png-list@ccrc.wustl.edu).
47 Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
48 Thomas Boutell and others (png-list@ccrc.wustl.edu).
53 The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.
54 See the specification for conditions of use and distribution.
56 The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of
57 Technology. See the specification for conditions of use and distribution.