thumbnail - create a TIFF file with thumbnail images


   thumbnail [ options ] input.tif output.tif


   thumbnail is a program written to show how one might use the SubIFD tag
   (#330) to store thumbnail images.  thumbnail  copies  a  TIFF  Class  F
   facsimile file to the output file and for each image an 8-bit greyscale
   thumbnail sketch.  The output file contains the  thumbnail  image  with
   the associated full-resolution page linked below with the SubIFD tag.

   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.


   -w     Specify the width of thumbnail images in pixels.

   -h     Specify the height of thumbnail images in pixels.

   -c     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: exp50 for a 50% exponential curve, exp60
          for  a 60% exponential curve, exp70 for a 70% exponential curve,
          exp80 for a 80% exponential curve, exp90 for a  90%  exponential
          curve,  exp  for  a  pure exponential curve, linear for a linear


   There are no options to control  the  format  of  the  saved  thumbnail


   tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3)

   Libtiff library home page:


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