xenial (1) thumbnail.1.gz

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% 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)

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