We present a novel error-diffusion technique for halftoning color-separated images. The method correlates the different ink planes in a pixelwise manner and minimizes the overlap of dots from different colors to optimize the color halftone with respect to graininess.It is a two-step error diffusion: in a first step it is determined how many ink drops should be placed at a particular pixel without specifying the color of these drops. In a second step the color of these ink drops is determined.
Koen Vande Velde, Paul A. Delabastita, "Improved Color Error Diffusion" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP17), 2001, pp 474 - 476, https://doi.org/10.2352/ISSN.2169-4451.2001.17.1.art00004_2