Color production with high chroma in a low lightness portion is realized by using an appropriate complementary color ink to a particular color ink reproducing the low lightness portion. More specially the device secondary color G-K is reproduced with ink of the pure color component composed of the color mixture of the particular color G ink and the basic color Y ink to tone the particular color G ink. In addition, as complementary color components, the particular color R ink and K ink are used. Thereby, the reproduction line is substantially linear from the device secondary color G point to the device K point. In color reproduction at the dark portion of the color on the G-K line, sufficient chroma can be obtained.