Cita:
On dark scenes it's not a big problem, you won't gain that much for having an all dark room. The problem is when there are dark parts in the picture and bright ones at the same time. On a white room, the bright parts on the screen will illuminate it and bounce back at the screen. This will lighten the dark parts of the picture, and you'll loose a lot of contrast. Unfortunately I have a white room (not home-cinema-exclusive...), and I notice this frequently. One of these days I was watching an animated movie with subtitles. There was a scene where there was a night sky of a very deep blue. I could see that the subtitles were also tinted blue, because all the room was illuminated with that color and bouncing it back at the screen. One way of minimizing this, without painting your room, is to have a higher gain screen, which has a narrower viewing position, and bounces less light to the ceiling and to the sides (and also reflects less light coming from those sides).
Dave.
Saludos