thumbnail
create a TIFF file with thumbnail images
see also :
tiffdump - tiffinfo
Synopsis
thumbnail
[ options ] input.tif output.tif
add an example, a script, a trick and tips
examples
source
python manage.py thumbnail cleanup
source
Image/Magick/Thumbnail version 0.06
===================================
Produces thumbnail images with ImageMagick.
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 ,
tiffgt, tiffinfo , libtiff
Libtiff library
home page: http://www.remotesensing.org/libtiff/