Choose Local Control Features
The real world is often quite different from the photograph that your camera captures. This is not your fault or the camera's; it is simply a reflection of the fact that the camera sees the world differently than people do. One very common problem is that the camera makes certain things brighter or darker in proportion to other objects in the scene compared to the way that you actually see them. Another problem is that color relationships are often recorded differently compared to the way people see them.
A way to correct these problems is to isolate them in a photograph so you can adjust them separately from the rest of the image. This is called local control as compared to overall or global control over ...