Are there different levels of "anamorphism"? What I mean is, can a disk be "partially anamorphic". The reason I ask is, I just bought a DVD which is labeled anamorphic... and just for fun I switched my DVD player setup from 4:3 display to 16:9 to see the "squished view". Well, the image was squished slightly but there were still black bars. Shouldn't the squished film be filling the entire 4:3 frame? Did they only do partial anamorphic? If so, why?