A technique of spatial encoding color photographic image in a black and white tran-sparency for coherent polychromatic processing is presented. The applications of this technique to color image signal detection, restoration of color blurred images, and color image addition and subtraction are provided. We note that this polychromatic processing technique is capable of processing color images similar to monochromatic coherent pro-cessing technique. Although there is a disadvantage of this technique, it requires an en-coding step for image processing, however this technique may open a new dimension in color image processing. We also note that the application of this technique is not res-tricted only to color images, it may apply to some problems in gray level transparencies.