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<!-- Creator : groff version 1.19.2 -->
<!-- CreationDate: Mon Jan 2 17:41:54 2006 -->
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<title>THUMBNAIL</title>
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<body>
<h1 align=center>THUMBNAIL</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#BUGS">BUGS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<a name="NAME"></a>
<h2>NAME</h2>
<p style="margin-left:11%; margin-top: 1em">thumbnail
− create a <small>TIFF</small> file with thumbnail
images</p>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<p style="margin-left:11%; margin-top: 1em"><b>thumbnail</b>
[ <i>options</i> ] <i>input.tif output.tif</i></p>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<p style="margin-left:11%; margin-top: 1em"><i>thumbnail</i>
is a program written to show how one might use the SubIFD
tag (#330) to store thumbnail images. <i>thumbnail</i>
copies a <small>TIFF</small> Class F facsimile file to the
output file and for each image an 8-bit greyscale
<i>thumbnail sketch</i>. The output file contains the
thumbnail image with the associated full-resolution page
linked below with the SubIFD tag.</p>
<p style="margin-left:11%; margin-top: 1em">By default,
thumbnail images are 216 pixels wide by 274 pixels high.
Pixels are calculated by sampling and filtering the input
image with each pixel value passed through a contrast
curve.</p>
<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−w</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify the width
of thumbnail images in pixels.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−h</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify the height
of thumbnail images in pixels.</p></td>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em" valign="top"><b>−c</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify a contrast
curve to apply in generating the thumbnail images. By
default pixels values are passed through a linear contrast
curve that simply maps the pixel value ranges. Alternative
curves are: <b>exp50</b> for a 50% exponential curve,
<b>exp60</b> for a 60% exponential curve, <b>exp70</b> for a
70% exponential curve, <b>exp80</b> for a 80% exponential
curve, <b>exp90</b> for a 90% exponential curve, <b>exp</b>
for a pure exponential curve, <b>linear</b> for a linear
curve.</p> </td>
</table>
<a name="BUGS"></a>
<h2>BUGS</h2>
<p style="margin-left:11%; margin-top: 1em">There are no
options to control the format of the saved thumbnail
images.</p>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
<p style="margin-left:11%; margin-top: 1em"><b>tiffdump</b>(1),
<b>tiffgt</b>(1), <b>tiffinfo</b>(1), <b>libtiff</b>(3)</p>
<p style="margin-left:11%; margin-top: 1em">Libtiff library
home page: <b>http://www.remotesensing.org/libtiff/</b></p>
<hr>
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