thumbnail(1)

THUMBNAIL(1)             USER COMMANDS               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 pix-
     els  high.   Pixels are calculated by sampling and filtering
     the input image with each pixel value passed through a  con-
     trast 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)

                 Last change: September 26, 1994                1