I ve talked to you about optimization pictures you have. As a rule, photos and another pictures are kept on a paper. Hence it s necessary to scan them. Again, it s unknown what type of scanner you use. Therefore my advice will be very common.
Any scanner can select the area of scanning.
For example, you have scanned a photo from some book and a portrayal contains a picture, margins of book and even something else except book. In this case a screen will be turned according to medium and a picture will worse than it could be. But is you ve selected an area exactly you need, a scanner will be turned rightly. For the same reason don t scan several photos at the same time. Don t regulate a brightness, contrast and color spectrum if you have no a special need.