1. A method of transforming a plurality of rasterized binary signals indicative of a binary input image into a multiple-bit per pixel gray scale image, comprising the steps of: (a) receiving the plurality of rasterized binary signals; (b) filtering the rasterized binary signals to produce a binary level slice from each one of a plurality of level-slice filters; and (c) combining the binary level slices to produce the multiple-bit per pixel gray scale image.