| 摘要 |
Electronic, digital screening of pictures, in particular for printing, where different types of screens are mixed for one and the same picture. In picture areas with a detailed structure a fine screen is used while for larger areas with a less detailed structure in grey or colour scales a more coarse screen is used. Coarser screens may further be used for the parts of the picture that are to be very light (for instance skin tones and shiny parts). By allowing the screens to be integer number multiples of each other automatically soft transitions are obtained and some picture points will be parts in both screens. |
