Improving Your Photos by Using RAW
I'm not a photographer. On a good day I'm taking nice snapshots, on a bad day I do a disservice to the 2 meg camera in my iPhone 3G. The only real "photographic" rule I follow is to try and crop the shot the way I want it. After that I honestly don't know enough about things like f-stops to chance switching over to manual mode, especially if I know there might not be another chance for the shot.
So the way I compensate is by shooting in RAW format. Currently I own a Canon Powershot that I was able to modify to shoot RAW images. I like to use RAW formats so I will have as much color space as possible to work with. A RAW image from your camera should have a much larger gamut than the typical JPEG camera capture, and if you edit images in something like Photoshop it's a major plus.

