| 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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