Photographic tone correction

Claim 1

PROCESS FOR THE PRODUCTION OF PHOTOGRAPHIC SILVER PRINTS CORRECTED FOR TONE VALUE IN BOTH THE HIGHLIGHTS AND SHADOWS WHICH COMPRISES (1) EXPOSING TO THE OBJECT TO BE REPRODUCED A PHOTOGRAPHIC FILM HAVING TWO SUPERIMPOSED SILVER HALIDE EMULSION LAYERS OF DIFFERENT SENSITIVITIES, THE LOWER LAYER HAVING A HIGHER SPEED AND LOWER GAMMA THAN THE UPPER MASKING LAYER AFTER DEVELOPMENT IN A BLACK-AND-WHITE DEVELOPER, (2) DEVELOPING SAID EXPOSED FILM TO PRODUCE AN UPPER LAYER IMAGE WHICH IS SELECTED FROM THE GROUP CONSISTING OF A SILVER IMAGE, A DYESTUFF IMAGE, AND A COMBINED SILVER AND DYESTUFF IMAGE, AND TO PRODUCE IN THE LOWER LAYER AN IMAGE SELECTED FROM THE GROUP CONSISTING OF A DYESTUFF IMAGE AND A COMBINED SILVER AND DYESTUFF IMAGE, THE LOWER IMAGE ABSORBING LIGHT OF TWO DIFFERENT WAVE LENGTHS TO A GREATER EXTENT THAN THE MASKING LAYER, THE COMBINED IMAGE HAVING A STEEPER GRADATION IN THE HIGHLIGHTS THAN IN THE OTHER PARTS OF THE REPRODUCTION CURVE, (3) PRINTING SAID IMAGES WITH LIGHT CONTAINING BOTH OF SAID DIFFERENT WAVE LENGTHS ON TO A PRINTING MATERIAL COMPRISING A SILVER HALIDE EMULSION LAYER WHICH IS SENSITIVE TO BOTH OF SAID WAVE LENGTHS OF LIGHT, THUS PRODUCING A PRINT CORRECTED ON THE ONE HAND AS REGARDS SHADOW DEFINITION AND ALSO CORRECTED AS TO HIGHLIGHT DEFINITION, AND (4) THEREAFTER DEVELOPING THE PRINTED IMAGE IN A SILVER HALIDE DEVELOPER TO FORM THE DESIRED PRINT.