Abstract: An apparatus for editing color image capable, by having a desired color in an original designated and an editing mode selected, of image editing for an image in the designated color in such an editing mode as trimming, masking, erasing, and conversion to another color. A desired color in an original image is designated by a designated color input portion and thereby designated color data for separated colors are obtained. Thereafter, the original image is scanned and image data for separated colors are obtained. The thus input image data are electrically edited in the selected edit mode based on the designated color data and the edited image data are output to an image forming unit and thereby an edited color image is obtained.

Abstract: A method of forming a plurality of printing screens, each having a selected frequency and angle, from a single masterdot of mxm elements where each element specifies a weight accorded a printing signal.

Abstract: An image input apparatus for an image scanning reading apparatus comprises a cylindrical holder for holding a plurality of originals and reference portions for calibration serving as references in reading original, a scanning head for scanning the original holder, and a memory for storing positions of the reference portions for calibration. The position of the reference portion for calibration is stored prior to the reading of the original, and when the scanning is started, the scanning head is moved to the stored position, the reference data for calibration is read by the scanning head at that position, and the corresponding original is read based on the data.