teem / bin

  ilk: Rotations

Rotating

It is often important to set the origin when doing rotations, since the origin is the one point you know will stay put:
ilk -i init.ppm -0 u:0,0 -t rotate:30 | tojpg > rot1.jpg
ilk -i init.ppm -0 u:0.5,0.5 -t rotate:30 | tojpg > rot2.jpg
ilk -i init.ppm -0 u:1,1 -t rotate:30 | tojpg > rot3.jpg