Multicolor image storage on black and white film using a crossed grating

Color images are stored on black and white film. Three fundamental components are extracted by means of color filters. Each component in turn is placed in contact with a grid, and in the Fourier plane, a mask selects two diffracted orders. Thus in the image plane each component modulates a different spatial carrier. The plate on which the three components are recorded diffracts as three superposed sinusoidal gratings, and the color image is retrieved by placing a demodulating mask-with appropriate color filters-in the Fourier plane of the plate. Considerations are given concerning the quality of the retrieved image, in particular the color fidelity.