For front projection ideally it should be black. You want as little reflective light to washout the dark areas of the screen as possible. Also any color that is reflected from the room will tint the overall image on the screen.
So black is best, dark gray next, dark colors after that. It helps a great deal to have the wall with the screen black. If you have a ceiling mounted projector, or if the screen is mounted high, it also helps a lot to have a black ceiling.
another question...if I did paint the walls/ceiling a flat black could I scatter some posters in non essential places, or would this defeat the purpose of the flat black paint, I'm only talking about a few posters. Its just the thought of an all black room depresses me.
Okay, since you've gotten two apparently different opinions, I will provide an amusing, but only potentially helpful, response.
There is a cajun chef (whose name escapes me at present) who was once asked on his TV show what the best wine for a certain dish was. He turned and smiled at the asker and said, "Why de bes' wine for dis here dish is de wine you likes best. Dat's de bes' wine for dis here dish."
So my advice is that in the long run, satisfying the waf may provide superior HT enjoyment than using either flat black or Kodak grey.
Yep! Justin Wilson is his name and I love his anti-dogmatic philosophy about cooking (and wine)! Haven't seen him lately...
You are the one who brought up waf. I suppose if you are talking about a dedicated HT which will not be used for other things, then a technical answer is probably appropriate. My wife and I have a "media room" which we use for music listening, reading and movie watching, so the color of the walls needed to "fit" the variety of activities.
Kevin Miller, a noted ISF tech, installer and National mag reviewer rec to me a dark, flat grey or black on the ceiling, a black on the screen wall and a neutral (preferred darker tone) on the other walls.
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