A color image forming apparatus separately corrects an intensity of each of color component images used for forming a multicolor image. The multicolor image is formed by superimposing a plurality of color component images on a printing paper. Each of the color component images is formed by one of ...http://www.google.de/patents/US5805314?utm_source=gb-gplus-sharePatent US5805314 - Color image forming apparatus separately correcting each color component image 
