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<!-- CreationDate: Mon Jan 2 17:41:54 2006 -->
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<title>THUMBNAIL</title>
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</head>
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<body>
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<h1 align=center>THUMBNAIL</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="#BUGS">BUGS</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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<p style="margin-left:11%; margin-top: 1em">thumbnail
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− create a <small>TIFF</small> file with thumbnail
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images</p>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>thumbnail</b>
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[ <i>options</i> ] <i>input.tif output.tif</i></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em"><i>thumbnail</i>
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is a program written to show how one might use the SubIFD
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tag (#330) to store thumbnail images. <i>thumbnail</i>
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copies a <small>TIFF</small> Class F facsimile file to the
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output file and for each image an 8-bit greyscale
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<i>thumbnail sketch</i>. The output file contains the
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thumbnail image with the associated full-resolution page
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linked below with the SubIFD tag.</p>
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<p style="margin-left:11%; margin-top: 1em">By default,
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thumbnail images are 216 pixels wide by 274 pixels high.
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Pixels are calculated by sampling and filtering the input
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image with each pixel value passed through a contrast
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curve.</p>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−w</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Specify the width
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of thumbnail images in pixels.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−h</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Specify the height
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of thumbnail images in pixels.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−c</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Specify a contrast
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curve to apply in generating the thumbnail images. By
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default pixels values are passed through a linear contrast
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curve that simply maps the pixel value ranges. Alternative
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curves are: <b>exp50</b> for a 50% exponential curve,
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<b>exp60</b> for a 60% exponential curve, <b>exp70</b> for a
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70% exponential curve, <b>exp80</b> for a 80% exponential
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curve, <b>exp90</b> for a 90% exponential curve, <b>exp</b>
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for a pure exponential curve, <b>linear</b> for a linear
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curve.</p> </td>
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</table>
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2002-10-07 09:47:36 -04:00
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<a name="BUGS"></a>
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<h2>BUGS</h2>
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<p style="margin-left:11%; margin-top: 1em">There are no
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options to control the format of the saved thumbnail
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images.</p>
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2002-10-07 09:47:36 -04:00
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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2006-01-02 18:50:44 -05:00
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<p style="margin-left:11%; margin-top: 1em"><b>tiffdump</b>(1),
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<b>tiffgt</b>(1), <b>tiffinfo</b>(1), <b>libtiff</b>(3)</p>
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<p style="margin-left:11%; margin-top: 1em">Libtiff library
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home page: <b>http://www.remotesensing.org/libtiff/</b></p>
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<hr>
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</body>
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</html>
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