Black image density correcting device

摘要

An image density correcting device for a color copying machine capable of producing monochrome copies and full color copies, the device including a toner density detecting means for detecting the toner density of a toner image transferred on a transfer medium; a toner density storing means for storing a predetermined reference value for the toner density; a toner density comparing/judging means for judging the toner density of the image by comparing the toner density detected by the toner density detecting means with the toner density reference value stored in the toner density storing means; and a toner density correcting means for correcting the toner density of the image based on the result of the comparison and judgment by the comparing/judging means, wherein the toner density is corrected after a black toner layer is formed in any non-black color detectable by the toner density detecting means, of areas where black toner layers are formed for monochrome copying with black toner.