thumbnail

 

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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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