Tone dependent rosette structures in multi layer screening by phase modulation.

摘要

A screening system comprises at least one screen of which the phase is tone or image level dependent. This tone dependent phase shift influences the rosette structure and can be used to improve the neutral balance and colour fidelity in multi-colour reproduction and to minimise the visibility of such rosette structures in highlight and shadow areas. In one embodiment the position of the centre point of a halftone dot within a haltone cell is tone dependent.