src/tiff/html/man/thumbnail.1.html

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   7 <title>THUMBNAIL</title>
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  10
  11 <h1 align=center>THUMBNAIL</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="#BUGS">BUGS</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>thumbnail &minus; create a <small>TIFF</small> file with
  29 thumbnail images</p>
  30 </td>
  31 </table>
  32 <a name="SYNOPSIS"></a>
  33 <h2>SYNOPSIS</h2>
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  40 <p><b>thumbnail</b> [ <i>options</i> ] <i>input.tif
  41 output.tif</i></p>
  42 </td>
  43 </table>
  44 <a name="DESCRIPTION"></a>
  45 <h2>DESCRIPTION</h2>
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  52 <p><i>thumbnail</i> is a program written to show how one
  53 might use the SubIFD tag (#330) to store thumbnail images.
  54 <i>thumbnail</i> copies a <small>TIFF</small> Class F
  55 facsimile file to the output file and for each image an
  56 8-bit greyscale <i>thumbnail sketch</i>. The output file
  57 contains the thumbnail image with the associated
  58 full-resolution page linked below with the SubIFD tag.</p>
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  60 <p>By default, thumbnail images are 216 pixels wide by 274
  61 pixels high. Pixels are calculated by sampling and filtering
  62 the input image with each pixel value passed through a
  63 contrast curve.</p>
  64 </td>
  65 </table>
  66 <a name="OPTIONS"></a>
  67 <h2>OPTIONS</h2>
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  74
  75 <p><b>&minus;w</b></p>
  76 </td>
  77 <td width="5%"></td>
  78 <td width="80%">
  79
  80 <p>Specify the width of thumbnail images in pixels.</p>
  81 </td>
  82 <td width="0%">
  83 </td>
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  85 <td width="10%"></td>
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  87
  88 <p><b>&minus;h</b></p>
  89 </td>
  90 <td width="5%"></td>
  91 <td width="80%">
  92
  93 <p>Specify the height of thumbnail images in pixels.</p>
  94 </td>
  95 <td width="0%">
  96 </td>
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  99 <td width="3%">
 100
 101 <p><b>&minus;c</b></p>
 102 </td>
 103 <td width="5%"></td>
 104 <td width="80%">
 105
 106 <p>Specify a contrast curve to apply in generating the
 107 thumbnail images. By default pixels values are passed
 108 through a linear contrast curve that simply maps the pixel
 109 value ranges. Alternative curves are: <b>exp50</b> for a 50%
 110 exponential curve, <b>exp60</b> for a 60% exponential curve,
 111 <b>exp70</b> for a 70% exponential curve, <b>exp80</b> for a
 112 80% exponential curve, <b>exp90</b> for a 90% exponential
 113 curve, <b>exp</b> for a pure exponential curve,
 114 <b>linear</b> for a linear curve.</p>
 115 </td>
 116 <td width="0%">
 117 </td>
 118 </table>
 119 <a name="BUGS"></a>
 120 <h2>BUGS</h2>
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 127 <p>There are no options to control the format of the saved
 128 thumbnail images.</p>
 129 </td>
 130 </table>
 131 <a name="SEE ALSO"></a>
 132 <h2>SEE ALSO</h2>
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 139 <p><b>tiffdump</b>(1), <b>tiffgt</b>(1), <b>tiffinfo</b>(1),
 140 <b>libtiff</b>(3)</p>
 141 <!-- INDENTATION -->
 142 <p>Libtiff library home page:
 143 <b>http://www.remotesensing.org/libtiff/</b></p>
 144 </td>
 145 </table>
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