The additive screen color photography techniques, as theorized by Maxwell, and as realized in the practical sense through the Dufaycolor and Autochrome processes discussed in the previous installment of this series, failed to gain broad and lasting acceptance due to some fundamental shortcomings. Additive techniques required color filters to be somehow maintained in register both for the initial image exposure and then to view the final product. These filters introduced image-degrading artifacts in the forms of lines, crosshatches, or grain patterns. The filters also screened out a significant percentage of the light hitting the film emulsion, effectively lowering their sensitivity and use in lower light situations.
Beginning in 1869 with the published papers accompanying his patents on the subject, Louis Arthur Ducos du Hauron set forth basic concepts of using subtractive color theory in color photography. The subtractive process removes certain colors from white light while allowing other colors. The three subtractive primary colors (cyan, magenta, yellow) are the complementary colors of the three additive primary colors (red, green, blue), and in combined use as filters can generate almost any color. Continue reading “A Brief History of Photography: Part 8 – Kodachrome & Color Film”