How can I change my green screen background in the editing process, to a different color like white,black, or purple. I know how to key out the green screen i just want to know how to change the color after i'm done keying out the green screen and leaving the subject still their.
Get a still image of the color you want to switch to. You can make one of these in Photoshop, GIMP, MS Paint, ECT. Then put it as the second layer footage in FCP. Then just Chroma key out the original color and the new color shows through.