A script to crop a batch of images around a face. This was written to automatically extract and crop faces for use in people's section in IISc CSA's website.

crop.sh

for file in ../*.JPG; do
  name=$(basename "$file")
  i=0
  ./facedetect --biggest --center "$file" | while read x y; do
    convert "$file" -crop 2521x2801+`expr ${x} - 1261`+`expr ${y} - 1200` "../face/${name%.*}_${i}.${name##*.}"
    convert "../face/${name%.*}_${i}.${name##*.}" -resize 135x150 "../face/${name%.*}.${name##*.}"
    rm "../face/${name%.*}_${i}.${name##*.}"
    mogrify -format png "../face/${name%.*}.${name##*.}"
    rm "../face/${name%.*}.${name##*.}"
    pngquant "../face/${name%.*}.png" --output "../face/${name%.*}.png" --force
    i=$(($i+1))
  done
done