Adding row of numbers Post: 302655139

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thumbnail

THUMBNAIL(1)						      General Commands Manual						      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.  Alternative curves are: exp50 for a 50% exponential curve, exp60 for a 60% exponen-
	      tial 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)

       Libtiff library home page: http://www.remotesensing.org/libtiff/

libtiff 							 November 2, 2005						      THUMBNAIL(1)