Two-color process (1908–1920s)—red and green (later red and cyan) instead of full RGB. Limited gamut but first commercially viable color film for narrative production.
Early color films looked like hand-colored postcards. Kinemacolor was the first industrial attempt to change that — not perfect, but revolutionary for its era. The system worked with only two color channels instead of three, thus using red and green (later red and cyan) to map the entire visible color spectrum. The British, particularly Charles Urban and his team, made it possible.
The technique: A special camera with rotating color filters in front of the lens captures two separate black-and-white images per second — an analog multiplex trick. In the lab, these are combined on an orthochromatic-sensitive negative; during projection, the projector again needs special filters. The viewer sees color — limited, but recognizable. Red works well, green too, but everything in between, especially blue and violet: total failure. This is why Kinemacolor films look strange today: skies are gray-green, blue clothing becomes dark green, skin gets a peculiar tone. But for landscapes, plants, and water, the system was usable.
In practice, this meant for cinematographers: limited light control, long exposure times, no improvisation — the color filters were precisely calibrated. Between 1910 and around 1920, hundreds of Kinemacolor productions were made, primarily in Great Britain — documentaries, travelogues, some feature films. The system was too expensive and too complicated for mass production, but it proved that color cinema was feasible.
Relevant today because every modern color film builds on the experiments of Kinemacolor. Here is the first scaling of a theoretical concept to practical production — exactly what Technicolor (with three colors) later perfected. When digitizing historical archive material, one finds Kinemacolor reels that look as if shot on another planet. This is not a scan error — this is the DNA of early color cinema.