Hey all, I have a Sammy HD845 hooked up via HDMI to my Toshiba 56HM195, upconverting to 1080i. I was poking through the setup menu on the Sammy, and noticed different color options in the Video setup sub-menu. The options are RGB-Normal, RGB-Expand, YCbCr-(4:4:4), and YCbCr-(4:2:2). Not really sure what these refer to, beyond what the owner's manual was able to tell me, which wasn't much. I set it to YCbCr (4:4:4), and that's where it is now. All I'd like to know is a)what each of these are, and b) which should I be using?