Paris: Gauthier-Villars, 1891. First edition. 12mo., xvi, 127 pp., illustrations in text, including one plate with a mounted color diagram of the visible color spectrum, and a folding diagram of Vogel's spectrographe with tissue guard. Quarter morocco and marbled boards, gilt-title within raised bands on spine. Some pencilled underlining and marks, and rubbing at the edges of the marbled paper, else very good. Item #26332
Léon Vidal (1834-1906) was head of the Association of Musée des Photographies Documentaires, which he founded, and a professor of photography at the École des Arts Decoratifs. An early and important text that furthered the attainment of a true three color photography through spectrology and orthocromatics, the process by which photographs of colors are represented by their degree of intensity.
Roosens and Salu No. 7667.