| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that although a super-tone cell system as a conventional method of representing halftones can represent 256 gradations irrelevantly to the number of screen lines by using 256 or more threshold matrixes even when the number of screen lines is increased, an abnormal pattern is generated depending upon gradations when dots as cores of a screen pattern are arranged in fixed-pattern order. SOLUTION: Provided are a dither matrix setting part which determines the cores of dots forming screen lines, the shapes of cores of dots changing with gradations, and the arrangement of cores of dots determining a screen angle, and a dot core arrangement generation part which generates the arrangement order of the dots of a dither matrix as a blue noise mask. COPYRIGHT: (C)2003,JPO
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