The color processor includes: a conversion source color data acquiring part acquiring a conversion source color dataset in a first color space; a color data pair acquiring part acquiring color data pairs each composed of color datasets in the first and second color spaces, the color datasets being used to calculate a color conversion characteristic model; a color conversion characteristic model calculator assigning weight to the color dataset in the first color space, according to a color difference distance from the conversion source color dataset, and calculates the model by use of color data pairs each including a weighted color dataset in the first color space; and an evaluation value calculator calculating an evaluation value indicating an evaluation on influence of the color data pairs on color conversion accuracy of the model. The color conversion characteristic model calculator adjusts the weight according to the evaluation value, when calculating the model.