Abstract: Color documents are reproduced in black-and-white in a manner that preserves color information through halftoning. Each image element on a color document is assigned a tag on the basis of its hue angle. The tag associates with that image element a particular halftone cell. The halftone cell has a distinct pattern associated with a pre-selected range of hue angles. The halftone cell is then applied to the luminance component of the image element. The result is a black-and-white image in which different hues appear as different halftone cells having distinct patterns and variations in the luminance are represented by the density of the resulting halftone.