1THUMBNAIL(1)                General Commands Manual               THUMBNAIL(1)
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NAME

6       thumbnail - create a TIFF file with thumbnail images
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SYNOPSIS

9       thumbnail [ options ] input.tif output.tif
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DESCRIPTION

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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OPTIONS

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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BUGS

37       There are no options to control  the  format  of  the  saved  thumbnail
38       images.
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SEE ALSO

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)
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