Method of prescreening of film

Claim 1

THE METHOD OF PRESCREENING CLAYDEN SENSITIVE PHOTOGRAPHIC FLIM WHICH COMPRISES PLACING SUBSTANTIALLY IN CONTACT WITH THE FLIM A UNIFORM HALFTONE TINT OF EFFECTIVELY OPAQUE APPROXIMATELY SHARP DOT CENTERS, EACH COVERING 1 TO 10 PERCENT OF THE TOTAL DOT AREA, PLACING A SHARP CROSS-LINE HALFTONE SCREEN AT ABOUT HALFTONE DISTANCE IN FRONT OF THE TINT AND FILM WITH THE INTERSECTIONS OF THE CROSSLINES REGISTERED IN FRONT OF THE DOT CENTERS, EXPOSING THE FILM SIMULTANEOUSLY THROUGH THE SCREEN AND THE TINT TO A HIGH INTENSITY SHORT DURATION UNIFORM EXPOSURE OF SUFFICIENT INTENSITY AND SUFFICIENTLY SHORT DURATION TO PRODUCE A CLAYDEN DESENSITIZATION, BETWEEN .05 AND .3 IN EQUIVALENT LOG E UNITS, NEAR THE EDGES OF SAID TINT DOT CENTERS AND TO PRODUCE ADDITIONAL CLAYDEN DESENSITIZATION UP TO A MAXIMUM, BETWEEN .6 AND 1.6 IN EQUIVALENT LOG E UNITS, AT THE DOT CORNERS ALIGNED WITH THE APERTURES OF SAID CROSSLINE SCREEN.