(This thread was started to show a factual scientific aspect of screen design involving projecting to a totally black screen surface. I crafted this post as a bit of a tease and was actually unaware that it would be viewed on Halloween day 2006. My intention was to bring a little fun into the science here and stimulate some thinking. Most viewing it enjoyed the process but some didn't. It has been brought to my attention some newcomers could read this and attempt this as a real world solution to building a screen. That's not the intent of the thread, the intent is to illustrate the concept of a neutral gray being used as a screen surface taken to an extreme limit. If you are new and want to learn more about neutral gray painted screens look to the links in my signature at the bottom of this post.)
(((( Like Myth Busters I must post this warning.. Don't Try This At Home!!!!))))
As many of you know I seldom start a new thread unless it's a topic I believe has not been covered before. This is such a thread I believe.
I finished a prototype screen tonight and its ambient light performance is so superior to anything I have seen to date I had to take some screen shots and post them for the group to view. Please excuse the picture quality they were taken soon after completing the screen and I just threw in a couple DVD's and looked for screen shots that had good light dark comparisons.
First let me explain the lighting conditions in my room for these shots. All room lights were on that's a total of (8) 60 watt ceiling flood lights the closest 2 being 4 foot from the screen. in addition I added (2) 100 watt bare bulbs each side of the screen about 3 feet in front of the screen and 2 feet to the sides. The ceiling is a gloss white pegboard material.
The pictures were taken hand held and with cam set to auto, flash off. The screen was larger than the image and the black masking you see top and bottom was the DLP projector self masking. The projector is my Sharp XR10X running in echo mode.
I post these photos to show the deep black levels that are possible with this new DIY screen under the most severe ambient conditions I have ever subjected a screen shoot to. Notice while keeping these rich dark blacks I'm able to maintain colors fairly good and even whites are not to far off.
I just finished watching a rather dark chapter from the movie King Kong and although the light level was not that of midday sun outside it was almost that bright and the images maintained a good contrast ratio.
Below are the screen shots. Please keep in mind the extreme ambient light levels when critiquing them.
I do have some pictures of the screen under room lights with projector off if anyone would like to see them, or details on how you can construct a similar screen.
Click thumbnail for full size image.....