| 摘要 |
The system has a printer, capable of rendering density with n density levels, adapted to print the colour separations at distinct spatial resolutions, so that when the colour separations are superposed on a substrate, a selected colour is defined. A source of image signals describe the colour document with a number of colour separations, each image signal representing optical density as one of m levels for a discrete area of a colour separation. A spatial resolution scaler is connected to the source of image signals. A halftone processor reduces the number of levels m representing optical density in a subset of the colour separations to a number of levels n representing optical density, the processor generating a first periodic pattern at a first spatial resolution. A second halftone processor reduces the number of levels m representing optical density in at least one remaining colour separation to a number of levels n representing optical density, the processor generating a second periodic pattern at a second spatial resolution. A video processor directs the distinct spatial resolution signals processed at each halftone processor to the printer to print the processed colour image. |
