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<title>THUMBNAIL</title>
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<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>
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<a name="NAME"></a>
<h2>NAME</h2>
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<p>thumbnail − create a <small>TIFF</small> file with
thumbnail images</p>
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<h2>SYNOPSIS</h2>
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<p><b>thumbnail</b> [ <i>options</i> ] <i>input.tif
output.tif</i></p>
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<h2>DESCRIPTION</h2>
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<p><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>
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<p>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>
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<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
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<p><b>−w</b></p>
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<p>Specify the width of thumbnail images in pixels.</p>
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<p><b>−h</b></p>
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<p>Specify the height of thumbnail images in pixels.</p>
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<p><b>−c</b></p>
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<p>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>
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<h2>BUGS</h2>
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<p>There are no options to control the format of the saved
thumbnail images.</p>
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<h2>SEE ALSO</h2>
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<p><b>tiffdump</b>(1), <b>tiffgt</b>(1), <b>tiffinfo</b>(1),
<b>libtiff</b>(3)</p>
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<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
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