Patent ID: 7839537
Filing Date: 2010-11-23
Classification: H04N

Abstract:
1. A processor for generating composite image data representing a mono-color input separation, the processor being adapted to: process the mono-color input separation data in accordance with a first halftone screen having a first screen angle to produce first halftone image data, wherein the first halftone image data includes a plurality of gray values for corresponding pixel locations, and each gray value represents a respective dot size, chosen from a plurality of different dot sizes, for the corresponding pixel; process the mono-color input separation data in accordance with a second halftone screen having a second screen angle different from the first screen angles to produce second halftone image data, wherein the second halftone image data includes a plurality of gray values for corresponding pixel locations, and each gray value represents a respective dot size, chosen from a plurality of different dot sizes, for the corresponding pixel; and combine the gray values of the first and second halftone image data to generate composite image data for the mono-color input separation such that the composite image data includes a first series of dot structures or line structures along lines at the first screen angle and a second series of dot structures or line structures along lines at the second screen angle, and the first and second series are present across the full tone scale, wherein the composite image data includes a plurality of gray values for corresponding pixel locations, each gray value represents a respective dot size, chosen from a plurality of different dot sizes, for the corresponding pixel, and the gray values of corresponding pixel locations in the first and second halftone image data are combined to generate gray values of the composite image data for those locations.