Just another point to bear in mind . . . I always save the original scan as an uncompressed .tif file. If you re-save a .jpg a couple of times, especially using compression, it will rapidly deteriorate. This seems especially noticeable with handwritten documents.
Mike.
PS. I have a few greyscale scans from my early experiments, and constantly regret not scanning in colour . . . especially since the originals have now been returned to their owner. If space is not a problem, I would always use colour.
