1. A method of generating, from a succession of images, a succession of mattes which correspond to scene object layers, respectively, comprising the steps of: generating a flow map, for one or more of the succession of images, that specifies how pixels move between adjacent images in the succession of images; separating groups of pixels, for the one or more succession of images, into distinct regions by combining pixels with similar flow values; and generating a matte for the distinct regions of the one or more of the succession of images to provide the succession of mattes.