Originally Posted by DavidHir
Just putting a projector in all white room with no treatment, no type of screen for that situation, etc. is not going to yield good results, but that's just my take. Hope it works out for you.
I realized that my response may have looked like I was offended. I'm not. I appreciate all feedback, so thank you for yours. I think maybe the way I described it, it sounds like it's an all white room with close side walls. It's not as bad as that...I'll explain.
I have dark green walls directly around the screen, but white bookcases about 12" on each side. However, the books cases are inset and start about 3 inches behind the screen. (If you look at the top view of the diagram, you'll see that the screen is actually closer to the viewer than the bookcases.) So light doesn't reflect directly from the white bookcases to the screen, unless the light makes a u-turn.
Light bouncing off the bookcases to would have to bounce off of something else before hitting my screen. My left wall is mostly a tannish yellow, but it's about 6 feet from the left of the screen. The right side, past the right bookcase is a hallway, so there is no light bouncing from there. On the floor is a big fuzzy gray carpet. So I don't really think I have that bad of a wall or floor problem.
I'm sure my biggest problem is my white ceiling, 6" above the screen. My basement has 6' 8" ceilings, so there isn't much I can do without using a smaller screen, which I'm not willing to do. After a month of staring at a 125" image, I'd never want to go much smaller.
I've been trying to think of a way to put some black velvet on the ceiling in front of the screen, but I can't think of a way to make something that wouldn't sag and at the same time be light enough to easily put up and down and not fall due to it's own weight.
The funny thing is that my black level is consistent across the screen. I would think that due to the white ceiling and dark gray carpet, I would see a much worse black level at the top of the screen than I do at the bottom. That makes me wonder just how much the white ceiling is contributing to black level, and how much of a difference it would make for me to somehow blackout the first 3 or so feet of the ceiling, while leaving everything else the same.
I'm only dealing with reflections and not a consistent external light source, which would be much worse. For example, if you are fighting against a bright open window, and you are watching a dark scene, you've obviously got a big problem. But for me, during a dark scene, there is less light coming out of the projector, and therefore less light bouncing off of my ceiling. During a bright scene, my ceiling lights up more, but at least I have the bright colors to trick my mind into perceiving the gray parts of the screen as closer to black than they really are.