How does changing the gamma setting via my DVD player(Mits DD-8040) affect picture quality? In broad strokes, I can see that a + setting seems to lighten the overall picture, and possibly skew it to blue. A - setting seems to darken it and skew it toward red. What exactly is it doing? Is it worth trying to recalibrate my display(Tosh 57HX81) to one of the other settings? I'm fairly satisfied now with my picture; I'm just wondering whether this setting could somehow enhance things with a little recalibration... Thanks.