THUMBNAIL(1) LibTIFF 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 fac-
simile 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. Alter-
native 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 im-
ages.
SEE ALSO
tiffdump (1), tiffgt (1), tiffinfo (1), libtiff (3tiff),
AUTHOR
LibTIFF contributors
COPYRIGHT
1988-2023, LibTIFF contributors
4.5 Nov 23, 2023 THUMBNAIL(1)
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