Once the preserve of Hollywood films and sophisticated television studios, green screen technology has now filtered down to within the reach of the average photographic consumer. So before we go too far lets take a brief look at what green screen photography actually is. It was originally (and still is) known as Chroma Keying, and works on the idea of using a background of one unique color most commonly green or blue, that can be easily selected and removed in post production software. Green and blue are used as they are well separated from the colors in a natural skin tone.