Patent ID: 7480076

Claim:
A method for forming non-orthogonal halftone screens for moiré free color halftoning, comprising: defining a first color halftone screen having a first fundamental frequency vector V c1 and second fundamental frequency vector V c2 ; defining a second color halftone screen having a first fundamental frequency vector V m1 and second fundamental frequency vector V m2 ; and, selecting the values of the fundamental frequency vectors to identify combinations that satisfy the following: V c ⁢ ⁢ 2 + V m ⁢ ⁢ 1 = - 1 2 ⁢ V c ⁢ ⁢ 1 , and ⁢ V c ⁢ ⁢ 1 - V m ⁢ ⁢ 2 = - 1 2 ⁢ V m ⁢ ⁢ 1 .