convert -size 283x283 xc:#FF0000 b.png; for i in {0..8}; do convert -size 200x200 xc:#FF0000 -rotate -$((i*10)) i$i.png; convert b.png i$i.png -gravity northeast -composite o$i.png; done; convert -layers optimize -loop 0 -delay 10 /o*.png /images/a.gif