Abstract: A digital copying machine provided with a device for forming color images by the formation, superposition of the images for each color in the order of the color face including a device for coding, compressing of a plurality of image signals separated in color by one page portion of the document so as to store in memory, a device for decoding, extending a plurality of compressed image signals stored in the memory, a color correcting device for converting a plurality of extended image signals into the color image signals for image formation so as to make the memory capacity smaller.

Abstract: An image processing apparatus comprises: an input device for supplying color image information; a discrimination unit to discriminate whether the color image information includes a predetermined image or not in accordance with a color distribution of the color image information supplied by the input device; and a processing circuit to process the color image information in accordance with the result of the discrimination of the discriminating means. The color image information is constructed by a plurality of color component signals. The color distribution is a distribution of the color image information in a color space.

Abstract: A color forming image apparatus for forming a multicolor image by forming an image of each color including a transfer member holder for retaining a plurality of transfer members. The image former forms the image on the transfer member based on an image signal from an external source. A detector detects information relating to a status of the transfer member held in the transfer member holder and sends the information to the external source.

Abstract: An image forming apparatus includes a reading section for fetching first color image data subjected to color separation, a circuit for converting the first color image data into second color image data, a unit for forming a duplicate image of the first color image data by using recording materials of different types based on the second color image data, a unit for calculating the consumptions of the recording materials used for image formation in the image forming unit, and a unit for calculating a charge value for image formation based on the consumption.