Patent ID: 6335734
Filing Date: 2002-01-01
Classification: H04N

Abstract:
A color converting method comprising:a conversion table forming step of forming a multi-dimensional conversion table in which an output color of a second color space corresponding to an input color of a first color space has been stored at each lattice point in a multi-dimensional conversion coordinates space having predetermined lattice intervals; a linear conversion parameter calculating step of calculating linear conversion parameters which are used in an interpolation calculation of an output color corresponding to an input color at a point other than the lattice points in said conversion coordinates space; a non-linear conversion parameter calculating step of calculating non-linear conversion parameters which are used in the interpolation calculation of the output color corresponding to the input color at a point other than the lattice points in said conversion coordinates space; a discriminating step of discriminating whether said linear conversion parameters are used or said non-linear conversion parameters are used each time the input color of said first color space is fetched; a linear interpolation calculating step of interpolation calculating an output color at an interpolation point by using said linear conversion parameters discriminated in said discriminating step; and a non-linear interpolation calculating step of interpolation calculating the output color at the interpolation point by using said non-linear conversion parameters discriminated in said discriminating step.