Abstract: An area of an original document sheet is to be selected for special treatment during reproduction say by an electrophotographic reproduction apparatus. Prior to selecting the area, a copy of the document is made using one type of toner and an image of a grid or other coded pattern is superimposed on this copy using the same or a second type or toner. The second pattern serves as a digitizing grid for use in identifying the area for selective treatment. In one embodiment, the pattern is formed with magnetic toner while the image of the original is reproduced with nonmagnetic toner. Alternatively, the pattern may be formed with operator readable grid coordinates allowing the operator to review the reproduction while away from the copier to determine digitizing inputs that may be manually input. In a second alternative embodiment, the pattern is formed with a different colored toner or a fluorescent toner.