Composite photography utilizing sodium vapor illumination

Claim 1

THE METHOD OF PRODUCING A PHOTOGRAPHIC RECORDD OF A FOREGROUND AND A PHOTOGRAPHIC MATTE, WHICH RECORD AND MATTER ARE SUITABLE FOR USE, TOGETHER WITH A SELECTED BACKGROUND RECORD, FOR PRODUCING A COMPOSITE PICTURE; SAID METHOD INCLUDING THE STEPS OF ILLUMINATING A FACE OF A BACKING WITH LIGHT ESSENTIALLY CONFINED TO A SUBSTANTIALLY MONOCHROMATIC BAND IN THE MEDIAL PORTION OF THE VISIBLE SPECTRUM, ILLUMINATING A FOREGROUND IN FRONT OF THE ILLUMINATED FACE OF THE BACKING WITH SUBSTANTIALLY WHITE LIGHT, FORMING A MAING IMAGE-FORMING BEAM OF LIGHT FROM BOTH THE ILLUMINATED FACE OF THE BACKING AND THE FOREGROUND, DIRECTING SAID MAIN BEAM OBLIQUELY UPON A SELECTIVE REFLECTING ELEMENT COMPRISING A MULTIPLE ARRAY OF INTERFERENCE LAYERS HAVING A REFLECTANCE PEAK CENTERED ADJACENT SAID MONOCHROMATIC BAND TO MOVE FROM THE MAIN BEAM A REFLECTED BEAM CONTAINING AT LEAST APPROXIMATELY 80% OF THE LIGHT OF SAID MONOCHROMATIC BAND RECEIVED FROM THE BACKING, AND CONTAINING FOREGROUND LIGHT WITHIN SAID REFLECTANCE PEAK AMOUNTING TO LESS THAN ABOUT 10% OF THE TOTAL LIGHT RECEIVED FROM THE FOREGROUND, THE LIGHT TRANSMITTED BY SAID REFLECTING ELEMENT FORMING A TRANSMITTED BEAM WHICH CONTAINS LIGHT FROM THE FOREGROUND DISTRIBUTED EFFECTIVELY UNIFORMLY THROUGHOUT THE VISIBLE REGION AND WHICH INCLUDES AT LAST APPROXIMATELY 90% OF THE TOTAL LIGHT RECEIVED FROM THE FOREGROUND, EXPOSING AN ACTINIC SURFACE TO SAID REFLECTED BEAM WITHOUT SHARPLY SELECTIVE ABSORPTIVE FILTERING THEREOF TO PRODUCE THE PHOTOGRAPHIC MATTE, AND EXPOSING AN ACTINIC SURFACE TO SAID TRANSMITTED BEAM WITHOUT SHARPLY SELECTIVE ABSOPRTIVE FILTERING THEREOF TO PRODUCE SAID PHOTOGRAPHIC RECORD OF THE FOREGROUND.