Patent ID: 7440135
Filing Date: 2008-10-21
Classification: H04N

Abstract:
1. A lattice point determining method for correspondence definition data creation whereby a plurality of lattice points which are referred to when correspondence definition data which defines correspondence between the ink quantities of inks in various colors used in a printing device and the color component values of various colors used in another image device is created are determined, the method comprising: defining both an ink quantity lattice point smoothness evaluation function which evaluates the smoothness of disposition of ink quantity lattice points in an ink quantity space whose components are said color ink quantities of inks in various colors and a lower-dimensional color lattice point smoothness evaluation function which evaluates the smoothness of the disposition of lower-dimensional color lattice points in a lower-dimensional color space defined by a smaller number of color components than the number of these inks; separately optimizing the ink quantity lattice points and the lower-dimensional color lattice points by separately enhancing the evaluations of said ink quantity lattice point smoothness evaluation function and said lower-dimensional color lattice point smoothness evaluation function; maintaining either of the ink quantity lattice points and the lower-dimensional color lattice points at optimized lattice points and readjusting the other optimized lattice points; and imposing limitation on ink quantity caused to adhere to a printing medium as a binding condition when a plurality of said lattice points are determined by said maintaining and readjusting, and carrying out said readjustment.