| 1 | .TH PNG 5 "October 3, 2002"
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| 2 | .SH NAME
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| 3 | png \- Portable Network Graphics (PNG) format
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| 4 | .SH DESCRIPTION
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| 5 | PNG (Portable Network Graphics) is an extensible file format for the
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| 6 | lossless, portable, well-compressed storage of raster images. PNG provides
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| 7 | a patent-free replacement for GIF and can also replace many
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| 8 | common uses of TIFF. Indexed-color, grayscale, and truecolor images are
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| 9 | supported, plus an optional alpha channel. Sample depths range from
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| 10 | 1 to 16 bits.
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| 11 | .br
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| 12 |
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| 13 | PNG is designed to work well in online viewing applications, such as the
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| 14 | World Wide Web, so it is fully streamable with a progressive display
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| 15 | option. PNG is robust, providing both full file integrity checking and
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| 16 | fast, simple detection of common transmission errors. Also, PNG can store
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| 17 | gamma and chromaticity data for improved color matching on heterogeneous
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| 18 | platforms.
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| 19 |
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| 20 | .SH "SEE ALSO"
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| 21 | .IR libpng(3), zlib(3), deflate(5), and zlib(5)
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| 22 | .LP
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| 23 | PNG 1.2 specification, July 1999:
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| 24 | .IP
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| 25 | .br
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| 26 | http://www.libpng.org/pub/png
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| 27 | .br
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| 28 | or ftp://ftp.uu.net/graphics/png/documents
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| 29 | .LP
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| 30 | PNG 1.0 specification, October 1996:
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| 31 | .IP
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| 32 | .br
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| 33 | RFC 2083
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| 34 | .IP
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| 35 | .br
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| 36 | ftp://ds.internic.net/rfc/rfc2083.txt
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| 37 | .br
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| 38 | or (as a W3C Recommendation) at
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| 39 | .br
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| 40 | http://www.w3.org/TR/REC-png.html
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| 41 | .SH AUTHORS
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| 42 | This man page: Glenn Randers-Pehrson
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| 43 | .LP
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| 44 | Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
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| 45 | Glenn Randers-Pehrson and others (png-list@ccrc.wustl.edu).
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| 46 | .LP
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| 47 | Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
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| 48 | Thomas Boutell and others (png-list@ccrc.wustl.edu).
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| 49 | .LP
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| 50 |
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| 51 |
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| 52 | .SH COPYRIGHT NOTICE
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| 53 | The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.
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| 54 | See the specification for conditions of use and distribution.
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| 55 | .LP
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| 56 | The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of
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| 57 | Technology. See the specification for conditions of use and distribution.
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| 58 | .LP
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| 59 | .\" end of man page
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| 60 |
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