Batch Processing using GMIC

for i in {1..999..8}
do
  gmic frame-`printf '%03d' $((i+0))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+0))`.png &
  gmic frame-`printf '%03d' $((i+1))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+1))`.png &
  gmic frame-`printf '%03d' $((i+2))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+2))`.png &
  gmic frame-`printf '%03d' $((i+3))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+3))`.png &
  gmic frame-`printf '%03d' $((i+4))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+4))`.png &
  gmic frame-`printf '%03d' $((i+5))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+5))`.png &
  gmic frame-`printf '%03d' $((i+6))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+6))`.png &
  gmic frame-`printf '%03d' $((i+7))`.png -cartoon 3,150,15 -o ../frames2/frame-`printf '%03d' $((i+7))`.png &
  wait
done