Light spillage -- how much with FP?

[MikeSp]

I have read where the back wall behind a FP screen should be painted black in order to avoid seeing any light spillage from the FP. (Also read where the back wall should be some pure neutral color that does not add color to the image on the screen and potentially take away from blacks on the screen when the eye compares the blacks on the screen that may appear grey as a result of a black wall).

QUESTION-- IF there is light spillage from a FP, how much is there, i.e., how far out from the screen does the light spillage reach? Will the 3 inch fuzzy surface of a good screen frame take care of the light spillage or how far away from the screen could light spillage occur?? Thanks

Mike

[Duane]

If you're using a crt front projector , then the borders on all sides can be controlled by the blanking feature that most of them have.This feature blacks out the horizontal and vertical borders with black bars.I cannot speak for digital projectors,but I'm betting they too will have the same feature.However,it's best to get the full raster from a crt projector.

Any type of projector will have a throw distance calculation for minimum and maximum positioning. If your projector is properly set up, then the image should fall within the boudaries of the screen.

As for the 3" border of a screen being black, that's a good size. Stewart has their Velux material and it absorbs any light spill. Others have similar,but I'm familiar with the Stewart. Having addition black around the screen provides snap to the image you see.That's what I did when I used a front projector. I've also seen applications of drapes around the screen.Usually the burgandy color.That really looks special and also controls any light spill and reflections.

Iv'e also seen screen bordered by cabinetry of dark wood.It does not eliminate light reflection, but get a lot of approval,if that's required.

Duane