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THUMBNAIL(1)					     THUMBNAIL(1)

NAME
       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)

			September 26, 1994	     THUMBNAIL(1)

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