[Anonymous]

The easiest option is to just use "Auto Levels". Photoshop will even the contrast out automatically. It's alot sloppier than adjusting Curves, but it actually does a fairly good job and should set it where all viewers can see it the way you intended. Remember, it will most likely look fairly dark on your screen. You may want to use Adobe Gamma Loader on your machine, or customize your proof setup options so you see it diff than it actually will turn out.