SWiMBO has decided that she wants our photos from the pre-digital era to be digitised. We elected to go with a Canoscan 8800F which got good reviews. First pass we have some very useable scans without the need for much tweaking. One problem is that the sky in some photos has blotches on it. Not sure where they are coming from and how I can easily solve them. One example below. Any ideas or tips would be much appreciated: