1. A method for processing digital video to have grain corresponding to a motion picture film, the method comprising: receiving a plurality of different grain assets corresponding to different film exposure levels; receiving a digital video image; separating the digital video image into a plurality of luminance delineated matte images; adding a different grain asset to each of the plurality of luminance delineated matte images to create a plurality of asset plates; and combining the plurality of asset plates to form a final digital video image.