rotate a picture around it's center

Question

Is there an easy way to rotate a picture around it\'s center? I used an AffineTransformOp first. It seems simple and need and finding the right parameters for a matrix should be

Answer 1

If I understand your question correctly, you can translate to the origin, rotate, and translate back, as shown in this example.

As you are using AffineTransformOp, this example may be more apropos. In particular, note the last-specified-first-applied order in which operations are concatenated; they are not commutative.