Rotation
The rotation portion of the URL allows the image to be rotated up to 360 degrees. You can also use the !n form to mirror and rotate the image. Note not all image servers support rotation and there are the following levels of support, known as compliance levels:
| Feature | Level |
|---|---|
| No rotation supported | Level 0 |
| Only 90 degree rotation supported | Optional in Level 1 mandatory in level 2 |
| Arbitrary rotation | Optional at all levels |
| Mirroring | Optional at all levels |
The Harvard image service supports all rotation parameters and is known as a Level 2 implementation.