Cinematographer and color pioneer Claude Friese-Greene, ca. 1926.
Claude’s father, motion picture pioneer Wiliam Friese-Greene, developed Biocolour, an additive color process where frames were shot at twice the normal speed through an alternating red and green filter, and later dyed correspondingly. When projected, it created the illusion of a color image (albeit with some heavy flickering). Claude refined the process and renamed it Friese-Greene Natural Colour (His camera, made by Vinten, can be seen in the background here).
His now well-known travelogue The Open Road was never given a wide release, and when he attempted to import the process to the US, he found his work had been outdone by the Technicolor company. Friese-Greene spent the remainder of his career as a cinematographer, at one point working with Alfred Hitchcock, and later co-working with Technicolor legend Jack Cardiff. .