1. A color processing apparatus, comprising: a memory for storing a plurality of colorimetric value sets obtained by measuring colors of color patches under a plurality of illuminants; an obtaining section, arranged to obtain a type of spectral distribution and white color information of a viewing illuminant; a selector, operable to select a calorimetric value set corresponding to the type of spectral distribution of the viewing illuminant from said memory; and a calculator, arranged to calculate a colorimetric value set under the viewing illuminant from the selected calorimetric value set, on the basis of the white point information of the viewing illuminant and white point information of an illuminant of the selected calorimetric value set.