src/tiff/html/man/tiffmedian.1.html

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   7 <title>TIFFMEDIAN</title>
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  10
  11 <h1 align=center>TIFFMEDIAN</h1>
  12 <a href="#NAME">NAME</a><br>
  13 <a href="#SYNOPSIS">SYNOPSIS</a><br>
  14 <a href="#DESCRIPTION">DESCRIPTION</a><br>
  15 <a href="#OPTIONS">OPTIONS</a><br>
  16 <a href="#NOTES">NOTES</a><br>
  17 <a href="#SEE ALSO">SEE ALSO</a><br>
  18
  19 <hr>
  20 <a name="NAME"></a>
  21 <h2>NAME</h2>
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  28 <p>tiffmedian &minus; apply the median cut algorithm to data
  29 in a <small>TIFF</small> file</p>
  30 </td>
  31 </table>
  32 <a name="SYNOPSIS"></a>
  33 <h2>SYNOPSIS</h2>
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  40 <p><b>tiffmedian</b> [ <i>options</i> ] <i>input.tif
  41 output.tif</i></p>
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  43 </table>
  44 <a name="DESCRIPTION"></a>
  45 <h2>DESCRIPTION</h2>
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  52 <p><i>tiffmedian</i> applies the median cut algorithm to an
  53 <small>RGB</small> image in <i>input.tif</i> to generate a
  54 palette image that is written to <i>output.tif</i>. The
  55 generated colormap has, by default, 256 entries. The image
  56 data is quantized by mapping each pixel to the closest color
  57 values in the colormap.</p>
  58 </td>
  59 </table>
  60 <a name="OPTIONS"></a>
  61 <h2>OPTIONS</h2>
  62 <!-- TABS -->
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  68
  69 <p><b>&minus;c</b></p>
  70 </td>
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  73
  74 <p>Specify the compression to use for data written to the
  75 output file: <b>none</b> for no compression, <b>packbits</b>
  76 for PackBits compression, <b>lzw</b> for Lempel-Ziv &amp;
  77 Welch compression, and <b>zip</b> for Deflate compression.
  78 By default <i>tiffmedian</i> will compress data according to
  79 the value of the <i>Compression</i> tag found in the source
  80 file.</p>
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  83 </td>
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  91 <p><small>LZW</small> compression can be specified together
  92 with a <i>predictor</i> value. A predictor value of 2 causes
  93 each scanline of the output image to undergo horizontal
  94 differencing before it is encoded; a value of 1 forces each
  95 scanline to be encoded without differencing. LZW-specific
  96 options are specified by appending a
  97 &lsquo;&lsquo;:&rsquo;&rsquo;-separated list to the
  98 &lsquo;&lsquo;lzw&rsquo;&rsquo; option; e.g. <b>&minus;c
  99 lzw:2</b> for <small>LZW</small> compression with horizontal
 100 differencing.</p>
 101 </td>
 102 </table>
 103 <!-- TABS -->
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 109
 110 <p><b>&minus;C</b></p>
 111 </td>
 112 <td width="6%"></td>
 113 <td width="80%">
 114
 115 <p>Specify the number of entries to use in the generated
 116 colormap. By default all 256 entries/colors are used.</p>
 117 </td>
 118 <td width="0%">
 119 </td>
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 123
 124 <p><b>&minus;f</b></p>
 125 </td>
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 128
 129 <p>Apply Floyd-Steinberg dithering before selecting a
 130 colormap entry.</p>
 131 </td>
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 133 </td>
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 137
 138 <p><b>&minus;r</b></p>
 139 </td>
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 141 <td width="80%">
 142
 143 <p>Specify the number of rows (scanlines) in each strip of
 144 data written to the output file. By default,
 145 <i>tiffmedian</i> attempts to set the rows/strip that no
 146 more than 8 kilobytes of data appear in a strip.</p>
 147 </td>
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 149 </td>
 150 </table>
 151 <a name="NOTES"></a>
 152 <h2>NOTES</h2>
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 159 <p>This program is derived from Paul Heckbert&rsquo;s
 160 <i>median</i> program.</p>
 161 </td>
 162 </table>
 163 <a name="SEE ALSO"></a>
 164 <h2>SEE ALSO</h2>
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 171 <p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
 172 <b>tiffcmp</b>(1), <b>libtiff</b>(3TIFF)</p>
 173 <!-- INDENTATION -->
 174 <p><b>Color Image Quantization for Frame Buffer Display</b>,
 175 Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</p>
 176 <!-- INDENTATION -->
 177 <p>Libtiff library home page:
 178 <b>http://www.remotesensing.org/libtiff/</b></p>
 179 </td>
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