Early 1910s color photography — three B&W exposures through RGB filters, then composited optically. Foundation of additive color mixing in cinema.
Prokudin-Gorsky Process
In the early 20th century, Sergey Prokudin-Gorsky developed a method that was set to revolutionize color photography—not through color film in the modern sense, but through an elegant optical solution: three successive black-and-white exposures on the same plate, each exposed through red, green, and blue filters. The idea was compelling: additive color mixing—natural light would superimpose these three grayscale informations when projected, and the eye would see color. A technical improvisation that demonstrates how photographers and filmmakers at the time solved color problems with optics and chemistry before Kodachrome and other multilayer processes became the standard.
For film history, this process is not merely historically relevant—it was proof that color was possible without needing expensive and chemically unstable methods. The three separations could be stored on glass or film strips, but also formed the conceptual basis for the later standardized additive RGB synthesis in cinema. Prokudin-Gorsky's images—portraits, landscapes from the Russian Empire—already show what was technically achievable when filtering was handled consistently. However, the patience required was enormous: three separate exposures in succession, without the subject moving, without modern shutter mechanisms.
In the practical application of the early silent film era, the process played a subordinate role—too cumbersome for narratives, too scientific for commercial cinema. Studios preferred to focus on coloring techniques (tinting, toning) or later on two- and three-strip processes like Technicolor, which worked directly on the film. Nevertheless: anyone who wants to understand additive color mixing—and this is still relevant today for digital image processing, for HD sensors, for any RGB pipeline in post-production—cannot bypass Prokudin-Gorsky's logic. Red, Green, Blue as separate information layers that combine optically permeates everything that came after him.
Its practical use today? The process explains *why* RGB works and shows that color in film is always a decomposition and recombination—whether analog or digital. Anyone working with color space conversion, with separations, or with the structure of digital cameras sees the DNA of this early concept everywhere: decompose the image into primary colors, store them, and recombine them later.