Video black: not real black, visible, and annoying, the curse of projections. The good news is since this problem is fairly global, there are alot of solutions. At UMKC, the typical CD-Rom shutter is a typical solution (it was also demonstrated in the 2007 Tech Expo), but we have found that it can be temperamental at certain angles. Rope, pulleys and a piece of cardboard have also produced usable shutters as well. We have even used pneumatically controlled shutters (with the dowser on a piston) which worked well (the noise was minimal since an exhaust was used.) However, if you use projectors enough, and fine control is important, there are a number of DMX controlled shutters now available commercially.
http://www.vshutter.com/
400 including shipping. Very lightweight (under a pound). pretty simple system with a shutter that covers the projector.
http://www.response-box.com/flapper.shtml
Slightly more expensive than the above product.
http://www.citytheatrical.com/la-dmxIris.htm#projector
from City Theatrical, much more expensive (775 list)
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