1THUMBNAIL(1) General Commands Manual THUMBNAIL(1)
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6 thumbnail - create a TIFF file with thumbnail images
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9 thumbnail [ options ] input.tif output.tif
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12 thumbnail is a program written to show how one might use the SubIFD tag
13 (#330) to store thumbnail images. thumbnail copies a TIFF Class F fac‐
14 simile file to the output file and for each image an 8-bit greyscale
15 thumbnail sketch. The output file contains the thumbnail image with
16 the associated full-resolution page linked below with the SubIFD tag.
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18 By default, thumbnail images are 216 pixels wide by 274 pixels high.
19 Pixels are calculated by sampling and filtering the input image with
20 each pixel value passed through a contrast curve.
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23 -w Specify the width of thumbnail images in pixels.
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25 -h Specify the height of thumbnail images in pixels.
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27 -c Specify a contrast curve to apply in generating the thumbnail
28 images. By default pixels values are passed through a linear
29 contrast curve that simply maps the pixel value ranges. Alter‐
30 native curves are: exp50 for a 50% exponential curve, exp60 for
31 a 60% exponential curve, exp70 for a 70% exponential curve,
32 exp80 for a 80% exponential curve, exp90 for a 90% exponential
33 curve, exp for a pure exponential curve, linear for a linear
34 curve.
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37 There are no options to control the format of the saved thumbnail
38 images.
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41 tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3)
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43 Libtiff library home page: http://www.remotesensing.org/libtiff/
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47libtiff November 2, 2005 THUMBNAIL(1)