1. A color compensation method for a three-dimensional color image, said method comprising the steps of: obtaining mapping data, in a uniform color space, representative of a transformation from chromaticity coordinate values of a standard white patch and a standard color patch irradiated with an achromatic reference light to respective chromaticity coordinate values of said standard white patch and said standard color patch irradiated with a chromatic color reference light; irradiating an object surface with said achromatic reference light; and determining a chromaticity coordinate value of said object surface irradiated with said chromatic reference light based on (i) said mapping data and (ii) a coordinate value of said object surface irradiated with said achromatic reference light.