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7 <title>THUMBNAIL</title>
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>
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28 <p>thumbnail − create a <small>TIFF</small> file with
32 <a name="SYNOPSIS"></a>
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40 <p><b>thumbnail</b> [ <i>options</i> ] <i>input.tif
44 <a name="DESCRIPTION"></a>
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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>
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
66 <a name="OPTIONS"></a>
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75 <p><b>−w</b></p>
80 <p>Specify the width of thumbnail images in pixels.</p>
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88 <p><b>−h</b></p>
93 <p>Specify the height of thumbnail images in pixels.</p>
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101 <p><b>−c</b></p>
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>
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127 <p>There are no options to control the format of the saved
128 thumbnail images.</p>
131 <a name="SEE ALSO"></a>
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139 <p><b>tiffdump</b>(1), <b>tiffgt</b>(1), <b>tiffinfo</b>(1),
140 <b>libtiff</b>(3)</p>
142 <p>Libtiff library home page:
143 <b>http://www.remotesensing.org/libtiff/</b></p>