CentOS 7.0 - man page for thumbnail (centos section 1)
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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 thumb-
nail 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 calcu-
lated by sampling and filtering the input image with each pixel value passed through a
-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% expo-
nential 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)
Libtiff library home page: http://www.remotesensing.org/libtiff/
libtiff November 2, 2005 THUMBNAIL(1)
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