Dufaycolor was an early color photographic process in the 1930s that created color images using a black-and-white film base. It worked by overlaying a pattern of red, green, and blue filters on the film, which captured color information when exposed to light. After development, the black-and-white film would display a color image when viewed through the filter screen. This method was used in both still photography and motion pictures, offering a way to produce color images before more modern color film processes were available.

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