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.  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.

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.  Alter-
	      native 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)

UNIX/Linux commands referenced on this page:

1. file