> Have you ever tried this? Actually, if you decompress and recompress an > image at the exactly same size and high quality ratio each time, very > little further degradation will occur. If you make small local adjustments > there will be very little change in other areas of the image and the area > of the new adjustment will change only to the extent of that adjustment. Dave As I'm sure you're aware much of it is down to those little 8x8 (or 16x16) blocks of pixels. What you say is fairly true - but real problems occur if you make slight crop adjustments between open/saves (unless they happen to be in multiples of 8 or 16 (depending on compression level). From the right/bottom edges of an image it's not too bad but from the top /left edges it will affect the whole image. Bob
