.TH PNG 5 "October 3, 2002"

.SH NAME

png \- Portable Network Graphics (PNG) format

.SH DESCRIPTION

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.

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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.

.SH "SEE ALSO"

.IR libpng(3), zlib(3), deflate(5), and zlib(5)

.LP

PNG 1.2 specification, July 1999:

.IP

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http://www.libpng.org/pub/png

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or ftp://ftp.uu.net/graphics/png/documents

.LP

PNG 1.0 specification, October 1996:

.IP

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RFC 2083

.IP

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ftp://ds.internic.net/rfc/rfc2083.txt

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or (as a W3C Recommendation) at

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http://www.w3.org/TR/REC-png.html

.SH AUTHORS

This man page: Glenn Randers-Pehrson

.LP

Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):

Glenn Randers-Pehrson and others (png-list@ccrc.wustl.edu).

.LP

Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):

Thomas Boutell and others (png-list@ccrc.wustl.edu).

.LP

.SH COPYRIGHT NOTICE

The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.

See the specification for conditions of use and distribution.

.LP

The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of

Technology.  See the specification for conditions of use and distribution.

.LP

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