Patent ID: 7750921

Claim:
A data processing method comprising the steps of: reading a lookup table for color matching correction; determining whether data corresponding to a color signal input from an input device is included within a color space range defined by the lookup table for color matching correction; shifting first data, which is not included in said color space range as a result of said determining step, to second data being included in the color space range while preserving hue and luminance so that the data after the shift is included in said color space range; computing, by a processor, a shift amount from the first data to the second data; performing a first color matching conversion of the second data being included in the color space range by using the lookup table for color matching correction; enlarging data corresponding to the color matching converted second data, while preserving hue and luminance, based on the shift amount computed in said computing step; and performing a second color matching conversion of the color signal input from the input device, and included within the color space range defined by the lookup table for color matching correction, by using the lookup table for color matching correction.