Perfecting press device

摘要

A double-side printing system where printing is made on both sides of a printing paper has an image density calculator which calculates the image densities of image data of the front side and image data of the back side, and a printing density reducer which reduces both the printing densities for printing the image data of the front side and the image data of the back side when at least one of the image densities of the image data of the front side and the image data of the back side is not smaller than a predetermined value.