Watermarking folders of images. imagemagick required

watermark.command

#!/bin/bash

# Put your files in origin folder

cd `dirname $0`

mkdir -p watermarked/origin

find origin -type d > watermarked/.dirs.txt
pushd watermarked
cat .dirs.txt | sed 's/.*/"&"/' | xargs mkdir -p
rm .dirs.txt
popd

find origin -type f \( -name "*.jpg" -or -name "*.png" -or -name "*.jpeg" \) -exec composite -tile watermark.png "{}" "watermarked/{}" \;

mv watermarked/origin/* watermarked/
rm -r watermarked/origin