Reducing multi-separation color moire by a variable undercolor removal andgray component replacement strategy

One common artifact in color printing is the moire caused by the superposit ion of the different color separations. This problem is well known and a co mmon approach to minimize the moire is the use of rotated halftone dots of precise frequency and angle for the different separations. In low resolutio n devices, the precise relationship between the different separations is co mmonly hard to satisfy and compromises have to be made. This paper describe s a method to vary the undercolor removal (UCR) and gray component replacem ent (GCR) schemes employed as a function of the predicted inter-separation moire in order to allow for a better trade-off in the halftone design.