I have just purchased an NEC VT460 projector with a brightness value of 1300 and a contrast value of 400:1 . I have just taken delivery of it and decided to paint one of my walls white. I can view a reasonable picture in the dark but the problem is that the blacks are milky and I am loosing detail in dark areas. The picture is almost unwatchable with the slightest of light in the room. Is this because the projector isnt up to the job or is it because I dont have a screen? or both? any advice would be greatfully received.