RENZOKUSHIKICHOOYOBISONOTANONAIYOOMOTSUTAGENBUTSUKARAFUKUSHABUTSUODENSHISHASHINTEKINISAKUSEISURUTAMENOHOHOOYOBISOCHI

摘要

Apparatus and method are disclosed for electrophotographically producing high quality reproductions from an original document sheet which contains continuous tone (pictorial) and line-type information. The locations of the different content portions of the original are determined using a sonic digitizer that is integrated with the exposure platen. The document sheet is exposed onto each of two image sectors of the apparatus' photoconductor with the exposure for each adjusted according to the content type that sector is to reproduce. A screen image is illuminated upon the image sector used to reproduce the pictorial information. A selective erase light source driven using information obtained from the digitizing operation is used to selectively erase areas of each image sector that is not to be reproduced by such sector. The image sectors are developed and transferred in register onto a copy sheet to form a high quality reproduction having screened pictorial information and unscreened line-type information. The apparatus may have multiple color development stations to reproduce the information in color. In yet another embodiment of the invention, information such as black and white line-art may be reproduced in the color provided on a colored swatch or sample. In this embodiment both the line-art and color-separation exposures of the swatch are exposed upon the same area of each of at least two image sectors. The sectors are developed with differently colored toners and the images thereon transferred in register onto a copy sheet to provide reproduction of the line-art in the color of the swatch.