Disclosed is a copying machine for forming a multicolored image, having a plurality of developing devices which contain toner of different colors, and a color image sensor for reading an original image. The copying machine judges each part of the original image whether to be a monochromatic area or a...http://www.google.com/patents/US5406366?utm_source=gb-gplus-sharePatent US5406366 - Color copying machine and a method of forming a multicolored image
