Make your photo look crisp.
Sharpness describes the clarity of detail in a photo and can be a valuable creative tool for emphasizing texture. Sharpening is intended to make edges in your photo look crisp. It can’t bring out-of-focus images into focus, but if your subject is in fact in focus, it can make it look significantly sharper. It does this by adding contrast to edges — that is, it brightens the bright side of an edge and darkens the dark side. In essence, it adds a very narrow shadow along an edge — and to our eye, shadows make things look more three dimensional.