A method includes forming a third halftone color plane, a fourth halftone color plane, and a fifth halftone color plane from a first halftone color plane and a second halftone color plane. In addition, the method includes performing a compression on the third halftone color plane, the fourth halftone...http://www.google.com/patents/US6967753?utm_source=gb-gplus-sharePatent US6967753 - Plane dependent compression
