The document is scanned and the information stored digitally in ROM circuits. The digital processing provides a simple control for the exposure of the process layer as well as the facility to correct the image. The information is added digitally from a second circuit and provides a simple indexing control for the composite copy.The digital addition of the data provides an electronic process with no detrimental effect in the copy quality. No additional document has to be overlaid on the first document and alignment etc. are operated electronically
