1. A color processing method comprising: using input means for inputting principal component data of a plurality of dimensions representing colors; and using change means for changing principal component data of each of the plurality of dimensions by using a weight corresponding to a contribution of the principal component data of each dimension so as to map, in a color reproduction range of a device, the colors represented by the input principal component data of the plurality of dimensions, wherein the weight of the principal component data of each dimension decreases as the contribution decreases.