The above example used a 288X288 pixel image, which is an integer multiple of 16X16. Here I repeat the same test using a 300X300 pixel image, NOT an integer multiple. This time, the initial JPEG still looks very good. But the four rotations intriduce considerable visible error. Photoshop, or any software, will not handle this amount of abuse well when the image size is not an integer multiple of 16X16.