Photomechanical processes

Claim 1

A METHOD OF PRODUCING SCREEN POSITIVES DIRECTLY FROM ORIGINALS BY A REVERSAL TECHNIQUE, WHICH METHOD COMPRISES EXPOSING A PHOTOGRAPHIC ELEMENT HAVING AN EMULSION OF HIGH CONTRAST BEHIND A HALF-TONE SCREEN TO LIGHT FROM AN ORGINAL SUBJECT, DEVELOPING THE SCEEEN LATENT IMAGE OBTAINED WITH AN AROMATIC PRIMARY AMINO DEVELOPING AGENT IN THE PRESENCE OF A COLOR COUPLER WHICH COMBINES WITH THE OXIDATION PRODUCTS OF SUCH DEVELOPER TO PRODUCE A DYE IMAGE, THEREBY PRODUCING A NEGATIVE SCREEN IMAGE MADE UP OF AREAS OF DEVELOPED SILVER WITH A DYE IMAGE IN SITU THEREWITH, SAID DEVELOPMENT BEING SUCH AS TO PRODUCE A DYE IMAGE WITH A GAMMA VALUE OF AT LEAST APPROXIMATELY 2.5, BLEACHING THE SAME SILVER IMAGE, EXPOSING THE UNEXPOSED AREAS OF THE SAID PHOTOGRAPHIC ELEMENT TO LIGHT INCIDENT ON THE SAME SIDE THEREOF AS THE ORIGINAL EXPOSURE, THE SAID LIGHT BEING OF A COLOR TO WHICH THE PHOTOGRAPHIC EMULSION IS SENSITIVE AND BEING OF SUCH INTENSITY THAT THE LIGHT IS SUBSTANTIALLY COMPLETELY ABSORBED BY THE SAID DYE IMAGE AT ITS MAXIMUM DENSITY, REDEVELOPING THE SAID PHOGOGRAPHIC ELEMENT TO A GAMMA OF AT LEAST APPROXIMATELY 4.0 IN A DEVELOPER WHICH WILL NOT REDEVELOP ANY RE-HALOGENIZED SILER NEGATIVE IMAGE WHICH MAY BE PRESENT, FIXING THE PHOTOGRAPHIC ELEMENT TO REMOVE THE SILVER HALIDE REMAINING BELOW THE NEGATIVE IMAGE WHICH HAS BEEN OPTICALLY SCREENED FROM THE SECOND EXPOSURE AND TO REMOVE ANY SILVER HALIDE REMAINING BELOW THE POSITIVE IMAGE AND ANY RE-HALOGENIZED SILVER OF THE NEGATIVE IMAGE, AND THEN REMOVING THE NEGATIVE DYE IMAGE.

Claim 2

A METHOD OF PRODUCING SCREEN POSITIVES DIRECTLY FROM ORIGINALS BY A REVERSAL TECHNIQUE, WHICH METHOD COMPRISES EXPOSING A PHOTOGRAPHIC ELEMENT HAVING AN EMULSION OF HIGH CONTRAST BEHIND A HALF-TONE SCREEN TO LIGHT FROM AN ORGINAL SUBJECT, DEVELOPING THE SCEEEN LATENT IMAGE OBTAINED WITH AN AROMATIC PRIMARY AMINO DEVELOPING AGENT IN THE PRESENCE OF A COLOR COUPLER WHICH COMBINES WITH THE OXIDATION PRODUCTS OF SUCH DEVELOPER TO PRODUCE A DYE IMAGE, THEREBY PRODUCING A NEGATIVE SCREEN IMAGE MADE UP OF AREAS OF DEVELOPED SILVER WITH A DYE IMAGE IN SITU THEREWITH, SAID DEVELOPMENT BEING SUCH AS TO PRODUCE A DYE IMAGE WITH A GAMMA VALUE OF AT LEAST APPROXIMATELY 2.5, BLEACHING THE SAME SILVER IMAGE, EXPOSING THE UNEXPOSED AREAS OF THE SAID PHOTOGRAPHIC ELEMENT TO LIGHT INCIDENT ON THE SAME SIDE THEREOF AS THE ORIGINAL EXPOSURE, THE SAID LIGHT BEING OF A COLOR TO WHICH THE PHOTOGRAPHIC EMULSION IS SENSITIVE AND BEING OF SUCH INTENSITY THAT THE LIGHT IS SUBSTANTIALLY COMPLETELY ABSORBED BY THE SAID DYE IMAGE AT ITS MAXIMUM DENSITY, REDEVELOPING THE SAID PHOGOGRAPHIC ELEMENT TO A GAMMA OF AT LEAST APPROXIMATELY 4.0 IN A DEVELOPER WHICH WILL NOT REDEVELOP ANY RE-HALOGENIZED SILER NEGATIVE IMAGE WHICH MAY BE PRESENT, FIXING THE PHOTOGRAPHIC ELEMENT TO REMOVE THE SILVER HALIDE REMAINING BELOW THE NEGATIVE IMAGE WHICH HAS BEEN OPTICALLY SCREENED FROM THE SECOND EXPOSURE AND TO REMOVE ANY SILVER HALIDE REMAINING BELOW THE POSITIVE IMAGE AND ANY RE-HALOGENIZED SILVER OF THE NEGATIVE IMAGE, AND THEN REMOVING THE NEGATIVE DYE IMAGE.