In the previous study, the author showed that it is difficult to obtain the optimum combination of color dyes satisfying both spectral and colorimetric color reproduction. The current ink jet printers have solved this problem by a multi-color ink jet system. However, the system above makes color separation process converting RGB to CMYK complicated. The purpose of this study is to reveal the characteristics of the optimum color dyes for spectral and colorimetric color reproduction by means of a computer simulation, and it gives direction in order to design subtractive color dyes. In this paper, spectral RMS error and the size of the color gamut were calculated between the optimum dye sets for spectral and colorimetric color reproduction. Then, the relationship between spectral RMS error and the size of color gamut was evaluated by the peak wavelengths and widths of absorption bands composing the optimum three dyes for colorimetric color reproduction. The result above shows that it is an effective way to make an absorption band at long wavelength broader for satisfying both spectral and colorimetric color reproduction.