Theory and experiment of the encoding of a color image via contact screen pulse-width modulation on a single piece of high contrast black-and-whitw (B&W) film and the reconstruction of the image in color from the film in a white-light imags processing system are described. The three primary colored components of a color image are sequentially and separately encoded on a high contrast B&W film. During the encoding process, the original image, filtered by a primary filter, is contact-printed through a one-dimensional contact screen onto the high contrast film. The three colored components are encoded with the line cells of the screen oriented at three different and properly separated angles. After encoding and development, the B&W film may bo placod at the input plane of a white-light image processor and an image can thou be reconstructed in color by appropriate filtering through three primary colors at the Fourier plane of the processor.