thumbnail - create a TIFF file with thumbnail images
SYNOPSIS
       thumbnail [ options ] input.tif output.tif
DESCRIPTION
       thumbnail  is  a program written to show how one might use
       the SubIFD tag (#330) to store thumbnail  images.   thumb
       nail  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  fil
       tering  the  input  image  with  each  pixel  value passed
       through a contrast curve.
OPTIONS
       -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 curve.
BUGS
       There are no options to control the format  of  the  saved
       thumbnail images.
SEE ALSO
       tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3)
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