thumbnail

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” is created. 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 width

Specify the width of thumbnail images in pixels.

-h height

Specify the height of thumbnail images in pixels.

-c contrast

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:

Curve	Description
exp50	50% exponential curve
exp60	60% exponential curve
exp70	70% exponential curve
exp80	80% exponential curve
exp90	90% exponential curve
exp	pure exponential curve
linear	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 (3tiff),