A bluescreen or greenscreen is the best, but you can key out any colour. Just make sure you stand in front of something that is 1 solid colour and not too close to the background for better seperation. Try to have it lit as evenly as possible and it will turn out great. Even lighting is the biggest part to chromakeying. Oh ya and 1 more thing I don't think the Matrox RTX100 can realtime chromakey out grey for some reason, but as long as you stand in front of any other colour it should work well. Good luck and happy chromakeying.
A well and evenly lit blue or green (my favorite) wall works best, and the standard paint is Roscoe chroma/luma key. I use long light boxes (baffled from the cameras viewpoint) to light *just* the wall, but not the subject several feet in front of it. The subject gets its own separate lighting treatment (even dramatic ones), paying attention to if one wants its shadow on the wall or not.
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