.TH PNG 5 "September 10, 2009"+
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.SH NAME+
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png \- Portable Network Graphics (PNG) format+
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.SH DESCRIPTION+
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PNG (Portable Network Graphics) is an extensible file format for the+
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lossless, portable, well-compressed storage of raster images. PNG provides+
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a patent-free replacement for GIF and can also replace many+
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common uses of TIFF. Indexed-color, grayscale, and truecolor images are+
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supported, plus an optional alpha channel. Sample depths range from+
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1 to 16 bits.+
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.br+
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+
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PNG is designed to work well in online viewing applications, such as the+
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World Wide Web, so it is fully streamable with a progressive display+
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option. PNG is robust, providing both full file integrity checking and+
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fast, simple detection of common transmission errors. Also, PNG can store+
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gamma and chromaticity data for improved color matching on heterogeneous+
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platforms.+
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.SH "SEE ALSO"+
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.IR libpng(3) ", " zlib(3) ", " deflate(5) ", and " zlib(5)+
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.LP+
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PNG specification (second edition), November 2003:+
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.IP+
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.br+
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  <http://www.w3.org/TR/2003/REC-PNG-20031110/+
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PNG 1.2 specification, July 1999:+
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.IP+
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.br+
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http://www.libpng.org/pub/png+
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.LP+
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PNG 1.0 specification, October 1996:+
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.IP+
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.br+
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RFC 2083+
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.IP+
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.br+
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ftp://ftp.rfc-editor.org:/in-notes/rfc2083.txt+
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.br+
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or (as a W3C Recommendation) at+
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.br+
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http://www.w3.org/TR/REC-png.html+
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.SH AUTHORS+
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This man page: Glenn Randers-Pehrson+
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.LP+
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Portable Network Graphics (PNG) Specification (Second Edition)+
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Information technology - Computer graphics and image processing -+
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Portable Network Graphics (PNG): Functional specification.+
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ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others.+
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.LP+
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Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):+
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Glenn Randers-Pehrson and others (png-list).+
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.LP+
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Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):+
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Thomas Boutell and others (png-list).+
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.LP+
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+
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.SH COPYRIGHT NOTICE+
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.LP+
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This man page is Copyright (c) 1998-2006 Glenn Randers-Pehrson.  See png.h+
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for conditions of use and distribution.+
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.LP+
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The PNG Specification (Second Edition) is+
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Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.+
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.LP+
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The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.+
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See the specification for conditions of use and distribution.+
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.LP+
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The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of+
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Technology.  See the specification for conditions of use and distribution.+
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.LP+
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.\" end of man page+
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