PS7. I have a very old pic thats overexposed on the bottom and too dark at the top. I tried curves but couldn't get it very good. So i want to try using the gradient tool and set it to darken the lighten as it travels from bottom to top. But i can't figure out how to get it to do that. Can anyone tell me how, and also how to adjust it so that the darkening begins to change to the proper degree at the right place in it's travel?