Halftone screen function value generating method and screen system

摘要

PURPOSE: To obtain a screen system and method improved to print and reproduce an image. CONSTITUTION: The screen system for printing and reproducing an image is provided with three independent screens. Each screen has plural screen lines and each different screen angle. At least two screen lines out of these screen lines are different and at least one vector of the sum of two frequency components of a pair of screens is equal to the frequency component of the remaining screen or equal to a multiple or a measure. The system is not provided with a screen having a screen angle offset by 30 deg. or its multiple and equalizing the vector length of frequency components.