Production of reverse reading positive images of a straight reading original

摘要

Process for the production of a reverse reading positive line and/or halftone image suited for use in the production of a lithographic offset printing plate, said process comprising the steps of: (1) photo-exposing a photographic negative working silver halide emulsion material comprising a negative working silver halide emulsion layer on a transparent film support and an anti-halation layer either between the emulsion layer and the film support or at the side of said support opposite the emulsion layer, the exposure of the emulsion layer occurring through the support and the anti-halation layer in a camera without a reversing optical system, (2) bringing the emulsion layer side of the photographic material into contact with an image-receiving material to form by diffusion transfer processing a visible silver image upon the latter, and (3) separating the photographic material from the image-receiving material.