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<!-- Creator : groff version 1.18.1 -->
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<!-- CreationDate: Mon Mar 13 18:03:12 2006 -->
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<html>
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<head>
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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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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<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>thumbnail − create a <small>TIFF</small> file with
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thumbnail images</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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<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><b>thumbnail</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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<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><i>thumbnail</i> is a program written to show how one
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might use the SubIFD tag (#330) to store thumbnail images.
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<i>thumbnail</i> copies a <small>TIFF</small> Class F
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facsimile file to the output file and for each image an
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8-bit greyscale <i>thumbnail sketch</i>. The output file
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contains the thumbnail image with the associated
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full-resolution page linked below with the SubIFD tag.</p>
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<p>By default, thumbnail images are 216 pixels wide by 274
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pixels high. Pixels are calculated by sampling and filtering
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the input image with each pixel value passed through a
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contrast curve.</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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<table width="100%" border=0 rules="none" frame="void"
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cols="5" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="3%">
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<p><b>−w</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 width of thumbnail images in pixels.</p>
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</td>
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<td width="0%">
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</td>
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="3%">
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<p><b>−h</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 height of thumbnail images in pixels.</p>
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</td>
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<td width="0%">
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</td>
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="3%">
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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 a contrast curve to apply in generating the
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thumbnail images. By default pixels values are passed
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through a linear contrast curve that simply maps the pixel
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value ranges. Alternative curves are: <b>exp50</b> for a 50%
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exponential curve, <b>exp60</b> for a 60% exponential curve,
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<b>exp70</b> for a 70% exponential curve, <b>exp80</b> for a
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80% exponential curve, <b>exp90</b> for a 90% exponential
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curve, <b>exp</b> for a pure exponential curve,
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<b>linear</b> for a linear curve.</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="BUGS"></a>
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<h2>BUGS</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>There are no options to control the format of the saved
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thumbnail images.</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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<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><b>tiffdump</b>(1), <b>tiffgt</b>(1), <b>tiffinfo</b>(1),
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<b>libtiff</b>(3)</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>
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