How to adjust camera settings on the iPhone?

How would you edit the settings for the camera like contrast and exposure? I have the iPhone 4 and when I go to settings, I don't see anything about the camera?

Download an app called "Snapseed" it does what you just described.

The iPhone 4 camera is equipped with various settings and options to help you capture optimal photos on the go. Adjust the camera settings on your iPhone to activate the rear-facing or front-facing camera.
http://techtips.salon.com/adjust-camera-settings-iphone-4964.html

There aren't any real settings unfortunately other than grid on and off, flash on and off, and HDR on and off.