I have multiple images stored in a set of organized folders. I need to re-size those images to a specific percentage recursively from their parent directory. I am running Ubuntu 11.10 and i prefer learning how to do that directly from the terminal.
You could use imagemagick. For instance, for resizing all the JPG images under the current directory to 50% of their original size, you could do:
for f in `find . -name "*.jpg"`
do
convert $f -resize 50% $f.resized.jpg
done
The resulting files will have ".jpg" twice in their names. If that is an issue, you can check the following alternatives.
For traversing/finding the files to resize, you can use xargs too. Example:
find . -name "*.jpg" | xargs convert -resize 50%
This will create copies of the images. If you just want to convert them in place, you can use:
find . -name "*.jpg" | xargs mogrify -resize 50%