Maxwell's three-color method and the first permanent color photograph

Background. James Clerk Maxwell suggested the three-color method in an 1855 paper on color vision, proposing that three black-and-white photographs of a scene taken through red, green, and blue filters could be projected through similar filters to reproduce all the scene's colors. The method rests on the Young-Helmholtz theory, which holds that the eye perceives color through three types of cone cells, and implies that any color can be produced by mixing red, green, and blue light.

The 1861 Demonstration. Thomas Sutton, an English photographer, served as the photographer for Maxwell's 1861 lecture at the Royal Institution. Sutton took three black-and-white photographs of a multicolored ribbon, each exposed through a different color filter. These images contained no actual coloring matter but preserved the color information in silver images. The resulting set is described as the first permanent color photograph due to its durability.

Significance. The demonstration validated Maxwell's theoretical prescription for color photography. By projecting the three monochrome separations through filters, the original colors were reconstructed. This process established the foundation for all practical color processes, whether chemical or electronic. The use of red, green, and blue filters aligned with the RGB color model, which later influenced digital displays and color television.