Because the spectral characteristics of an original of a printing sheet and those of an original of a photographic image are different, in the case where the same color conversion table is applied at the time of color conversion processing, a deviation occurs in color reproducibility. The apparatus also has a first output current path and a second output current path with a shunting output resistance therebetween. The power supply may be directly connected to an adjacent wall outlet, which serves as a power source, in the same or an adjacent wall box.