Gimp Script Fu script to resize an image.
Copy to ~/.gimp-2.8/scripts.
Run Gimp with a batch command of "gimp-file-scale" with your file and target resize scaling ratio:
gimp -i -b '(gimp-file-scale "Pictures/image.jpg" 0.5)'
The resized file will be saved next to the original with a "-resized" suffix. For example, in the above example the output file will be "Pictures/image-resized.jpg".
This script operates on a single file. Use a Unix find to operate on many
files, for example:
find Pictures -name '*.jpg' |
xargs printf '(gimp-file-scale "%s" 0.2)\n' |
gimp -i -b -
GNU General Public License, version 3