Well, if you understand how cameras work, you can tinker in an educated and informed way... For example, if you make your shutter speed fast, the camera will open the apperture more, to let the same amount of light in. In doing so, it will narrow the depth of field. So if you have the pretty girl as the subject, you want her in sharp focus, but the scenery behind her blurred... The white balance can offset the blue of fluorescent lights or the red of incandescent ones... As you can see, it's a complex thing. Samsung simplified it by having all the different modes like sports mode etc....