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thumbnail - create a TIFF
file with thumbnail
images
thumbnail [ options ] input.tif output.tif
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.
- -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.
There are no options to control the
format of the saved thumbnail images.
tiffdump(1)
, tiffgt(1)
, tiffinfo(1)
,
libtiff(3)
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