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1 .TH PNG 5 "September 18, 2008" |
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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 specification (second edition), November 2003: |
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24 .IP |
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25 .br |
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26 <http://www.w3.org/TR/2003/REC-PNG-20031110/ |
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27 PNG 1.2 specification, July 1999: |
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28 .IP |
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29 .br |
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30 http://www.libpng.org/pub/png |
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31 .LP |
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32 PNG 1.0 specification, October 1996: |
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33 .IP |
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34 .br |
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35 RFC 2083 |
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36 .IP |
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37 .br |
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38 ftp://ftp.rfc-editor.org:/in-notes/rfc2083.txt |
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39 .br |
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40 or (as a W3C Recommendation) at |
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41 .br |
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42 http://www.w3.org/TR/REC-png.html |
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43 .SH AUTHORS |
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44 This man page: Glenn Randers-Pehrson |
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45 .LP |
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46 Portable Network Graphics (PNG) Specification (Second Edition) |
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47 Information technology - Computer graphics and image processing - |
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48 Portable Network Graphics (PNG): Functional specification. |
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49 ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others. |
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50 .LP |
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51 Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999): |
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52 Glenn Randers-Pehrson and others (png-list). |
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53 .LP |
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54 Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996): |
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55 Thomas Boutell and others (png-list). |
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56 .LP |
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57 |
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58 |
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59 .SH COPYRIGHT NOTICE |
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60 .LP |
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61 This man page is Copyright (c) 1998-2006 Glenn Randers-Pehrson. See png.h |
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62 for conditions of use and distribution. |
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63 .LP |
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64 The PNG Specification (Second Edition) is |
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65 Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved. |
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66 .LP |
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67 The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson. |
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68 See the specification for conditions of use and distribution. |
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69 .LP |
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70 The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of |
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71 Technology. See the specification for conditions of use and distribution. |
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72 .LP |
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73 .\" end of man page |
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74 |