ABSTRACT
When photographers first start to enhance their photos, they tend to apply changes to the whole of the photo. Very quickly though, we all find that there are times when you will want to restrict the alterations to just one part of the photograph. Thankfully the mechanics of isolating changes in a digital photograph is easier than when photographers worked in the darkroom with pieces of cardboard on short lengths of wire. That said, the basis of this approach is much the same as in darkroom days. Shield the parts of the photo where you don't want changes while enhancing the sections where you do want changes.
