1. A method for maintaining a uniform noise pattern over a background scene portion of a composite image of the background scene and a foreground scene without degrading the image quality of the foreground scene comprising: a) obtaining a sample noise pattern signal for a colored backing used to create the foreground scene, said foreground scene including said backing and an overshoot portion which extends past the boundary of the backing; b) generating a garbage matte signal corresponding to said overshoot portion; c) adding said sample noise pattern signal to said garbage matte signal to produce a modified garbage matte signal; d) creating the composite image using said modified garbage matte signal and signals representing said foreground scene and said background scene.