Patent ID: 7933044

Claim:
A method for halftoning image data in a color system, the method comprising: receiving image data; 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 ; 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 ; a printing apparatus applying the defined first color halftone screen and the defined second color halftone screen to the received image data; and printing the result.