The theory of colorimetry is well developed and has been applied in the field of cultural relic conservation and restoration. With the advantages of being accurate and quantitative, this method is not susceptible to subjective influence. Restoration effects on ancient ceramics are greatly affected by light sources. Unsatisfactory visual effects of restoration may occur if the light sources of the repair room and the exhibition hall do not match each other. In our study, according to the theory of colorimetry, we improved the color-rendering performances of objects under different light sources with the aid of colorimeter. This work paves the way for quantitative coloring in the future.