A method of generating one image dot from three image pixels. The values of the three pixels are summed. If the sum indicates a dot that is equal to or darker than ⅔ black, the two outer thirds of the dot are set to black and the central third is set to a shade of gray. If the sum indicates a dot that is equal to or lighter than ⅓ white, central third of the dot is set to white and the outer two thirds are set to a shade of gray. The shades of gray are generated by using high addressability, and error diffusion is used to diffuse the rounding off errors implicit in the high addressability process.