Ok, back again. I did some tests myself. I took one of the original images and rotated it four times in photoshop 7 and saved it with a quality setting of 12 each time. As you can see, its not the same image as before. I followed Michaslink and found a list of software which should be able to do lossless rotation. On this list was also NikonView, the software I use to transfer the images from camera to my computer. I did the same here, and though the image size changes (+-20 kbyte on a 700 kbyte image), the picture didnt change. as there was nothing interesting to see, I made no screenshot. So for anyone interested, the link posted above should point out some software which can do lossless JPEG rotation. Thanks again for all your help!