Convert all images in a directory tree recursively to gray scale and put them into out folder.

convert-bw.sh

for f in `find . -name "*.jpg"`
do
    #echo "mkdir -p `echo out$f | xargs dirname | sed "s/\.\//\//"`"
    mkdir -p `echo out$f | xargs dirname | sed "s/\.\//\//"`
    #echo "convert $f -set colorspace Gray -separate -average `echo out$f | sed -e "s/\.\//\//"`"
    convert $f -set colorspace Gray -separate -average `echo out$f | sed -e "s/\.\//\//"`
done