Could I use a green fabric as a green screen? Where could I get fabric?

[bojadada]

As the title says. If it is possible, is there an exact shade of green I have to get, or is it just general light green. Would I be able to get fabric at Walmart?

[gadgetguy]

There is paint and fabric available that is exact RGB green and it's expensive, but nearly anything can be worn in the foreground. Most chroma-key software allows for fudge-factors and if you're careful with your foreground colors and lighting you should be able to make nearly anything work. A local public access channel doesn't have any green screens. They just project green onto a normal screen from a projector.
Of course, in addition to lighting and foreground, your camera and format are going to affect how successful your chroma-key works too.

[Poppa_Meth]

I just saw an ad on TV the other day for some new game that uses a fabric greenscreen background and something like a webcam to play. Something about acting out scenes from your favorite movie. Might be worth looking into just to get the fabric if it's fairly inexpensive.