Patent ID: 7595921
Filing Date: 2009-09-29
Classification: H04N

Abstract:
1. A profile creation method for creating a profile referred to during conversion from one color system to another by a profile creating device, the method comprising the step of: obtaining output color data associating the output colors for first and second color component data determined in advance; generating an interpolation function by an interpolation function correction unit based on the output color data for the first color component data and correcting said interpolation function by the interpolation function correction unit such that the interpolation results for said second color component data approximately match the output color data therefore; and generating a profile by a profile generating unit based on the corrected interpolation function, wherein the output color data for said first color component data is data that associates first grid points in a first color space and grid points in a second color space, and the output color data for said second color component data is data that associates second grid points that are different from said first grid points but reside in said first color space and grid points in said second color space, said first grid points are arranged along multiple parallel lines formed in said first color space, said interpolation function is an interpolation function that uses color component values in the first color space as independent variables and color component values in the second color space as dependent variables, and includes the independent variable values and dependent variable values for the first grid points surrounding the grid point to be interpolated, the second-order differentiation values of these dependent variables, and the independent variable values for the grid point to be interpolated, said interpolation function correction step changes the terms related to the independent variables in said interpolation function to polynomial expressions of a higher order than existed prior to correction, and said first color component data used for generating said interpolation function is different from said second color component data used for correcting said interpolation function.