To realize a color region transforming which can utilize effectively a color region which can be realized when a specific color recording agent is used.

A transformation relation of final map color reproducing zone Z402 from a monitor color reproducing zone Z201 can be obtained in the same hue Rs as special color ink Red and a hue of its vicinity. That is, about the hue of the specific color ink Red or the color region of the hue of its vicinity, the color region exceeding the color region of the monitor is obtained. As a result, in these hues, a transformation intensifying a saturation at higher brightness side than that of the maximum saturation part of the color reproducing region of the monitor can be performed. In this high saturation part, the map having a large change of the brightness is performed, and the color region transformation can be performed in which the color region realized by the special color ink is effectively utilized.