Novel Image Duplication Technique Utilizing Fourier Optics
Peter F. Mueller, David J. Cronin, George O. Reynolds · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1981
In the normal process of duplicating Photographic images from original negatives, resolutions of 200 cycles/mm have been neasured. lie will present a new duplication technique which has the capability of reducing this resolution loss to a few Percent at resolutions between 300 and 500 cycles/mm while simultaneously maintaining the continuous-tone quality and dynamic range of the original. The technique creates a modulated phase image dupe which produces a high resolution, continuous-tone, speckle free, image when observed through a white light Fourier optical viewing system. Plastic phase relief images with 70mm formats were made by this technique. Resolution transfers of nearly 100% at 228 cycles/mm were measured in images having excellent continuous-tone quality. The dynamic range of the retrieved images is comparable with that achieved in conventional photographic duplicates. Diffraction efficiencies greater than 20% in one diffracted order of the viewing system were also measured in the system.