Watermarks all images selected in MacOS Finder application with a transparent logo overlay

watermark-images.sh

#!/bin/bash
exec 2>&1
export PATH=/usr/local/bin:$PATH

for image in "$@"
do
 if [ -s "$image" ]; then
    filename=$(basename "$image")
    dirname=$(dirname "$image")
    mkdir -p "$dirname"/watermarked
	  output="${dirname}/watermarked/${filename}"
    composite -dissolve 50% -gravity southwest -geometry +10+10 \
      ~/.watermark/logo_page_transparent.png "$image" "$output"
    echo "watermarked $output"
  fi
done