| author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
| Tue, 06 Jul 2010 15:10:48 +0300 | |
| changeset 30 | 5dc02b23752f |
| parent 0 | 1918ee327afb |
| permissions | -rw-r--r-- |
| 0 | 1 |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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<title>TIFFMEDIAN</title> |
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<h1 align=center>TIFFMEDIAN</h1> |
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<a href="#NAME">NAME</a><br> |
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<a href="#SYNOPSIS">SYNOPSIS</a><br> |
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<a href="#DESCRIPTION">DESCRIPTION</a><br> |
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<a href="#OPTIONS">OPTIONS</a><br> |
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<a href="#NOTES">NOTES</a><br> |
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<a href="#SEE ALSO">SEE ALSO</a><br> |
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<hr> |
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<a name="NAME"></a> |
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<h2>NAME</h2> |
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<table width="100%" border=0 rules="none" frame="void" |
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<td width="91%"> |
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<p>tiffmedian − apply the median cut algorithm to data |
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in a <small>TIFF</small> file</p> |
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</td> |
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</table> |
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<a name="SYNOPSIS"></a> |
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<h2>SYNOPSIS</h2> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p><b>tiffmedian</b> [ <i>options</i> ] <i>input.tif |
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output.tif</i></p> |
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</td> |
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</table> |
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<a name="DESCRIPTION"></a> |
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<h2>DESCRIPTION</h2> |
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<p><i>tiffmedian</i> applies the median cut algorithm to an |
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<small>RGB</small> image in <i>input.tif</i> to generate a |
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palette image that is written to <i>output.tif</i>. The |
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generated colormap has, by default, 256 entries. The image |
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data is quantized by mapping each pixel to the closest color |
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values in the colormap.</p> |
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</td> |
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</table> |
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<a name="OPTIONS"></a> |
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<h2>OPTIONS</h2> |
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<p><b>−c</b></p> |
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</td> |
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<td width="5%"></td> |
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<td width="80%"> |
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<p>Specify the compression to use for data written to the |
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output file: <b>none</b> for no compression, <b>packbits</b> |
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for PackBits compression, <b>lzw</b> for Lempel-Ziv & |
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Welch compression, and <b>zip</b> for Deflate compression. |
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By default <i>tiffmedian</i> will compress data according to |
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the value of the <i>Compression</i> tag found in the source |
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file.</p> |
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</td> |
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</td> |
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</table> |
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<p><small>LZW</small> compression can be specified together |
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with a <i>predictor</i> value. A predictor value of 2 causes |
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each scanline of the output image to undergo horizontal |
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differencing before it is encoded; a value of 1 forces each |
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scanline to be encoded without differencing. LZW-specific |
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options are specified by appending a |
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‘‘:’’-separated list to the |
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‘‘lzw’’ option; e.g. <b>−c |
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lzw:2</b> for <small>LZW</small> compression with horizontal |
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differencing.</p> |
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</td> |
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</table> |
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<!-- TABS --> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="5" cellspacing="0" cellpadding="0"> |
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<td width="10%"></td> |
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<td width="2%"> |
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<p><b>−C</b></p> |
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</td> |
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<td width="6%"></td> |
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<td width="80%"> |
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<p>Specify the number of entries to use in the generated |
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colormap. By default all 256 entries/colors are used.</p> |
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<td width="10%"></td> |
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<p><b>−f</b></p> |
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</td> |
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<td width="6%"></td> |
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<td width="80%"> |
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<p>Apply Floyd-Steinberg dithering before selecting a |
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colormap entry.</p> |
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<td width="10%"></td> |
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<td width="2%"> |
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<p><b>−r</b></p> |
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</td> |
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<td width="6%"></td> |
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<td width="80%"> |
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<p>Specify the number of rows (scanlines) in each strip of |
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data written to the output file. By default, |
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<i>tiffmedian</i> attempts to set the rows/strip that no |
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more than 8 kilobytes of data appear in a strip.</p> |
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</td> |
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<td width="0%"> |
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</td> |
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</table> |
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<a name="NOTES"></a> |
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<h2>NOTES</h2> |
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<table width="100%" border=0 rules="none" frame="void" |
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cols="2" cellspacing="0" cellpadding="0"> |
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<tr valign="top" align="left"> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p>This program is derived from Paul Heckbert’s |
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<i>median</i> program.</p> |
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</td> |
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</table> |
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<a name="SEE ALSO"></a> |
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<h2>SEE ALSO</h2> |
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<td width="8%"></td> |
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<td width="91%"> |
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<p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1), |
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<b>tiffcmp</b>(1), <b>libtiff</b>(3TIFF)</p> |
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<!-- INDENTATION --> |
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<p><b>Color Image Quantization for Frame Buffer Display</b>, |
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Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</p> |
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<p>Libtiff library home page: |
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<b>http://www.remotesensing.org/libtiff/</b></p> |
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</td> |
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</table> |
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<hr> |
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</body> |
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</html> |