LA PHOTOGRAPHIE DES OBJETS COLORÉS AVEC VALEURS RÉELES.; MANUEL DES PROCÉDÉS ISOCHROMATIQUES ET ORTHOCHROMATIQUES. Herman Wilhelm Vogel.
LA PHOTOGRAPHIE DES OBJETS COLORÉS AVEC VALEURS RÉELES.; MANUEL DES PROCÉDÉS ISOCHROMATIQUES ET ORTHOCHROMATIQUES.

LA PHOTOGRAPHIE DES OBJETS COLORÉS AVEC VALEURS RÉELES.; MANUEL DES PROCÉDÉS ISOCHROMATIQUES ET ORTHOCHROMATIQUES.

Paris: Gauthier-Villars, 1887. First edition. 8vo., ix, 193 pp., 2 plates, containing 2 photoglypties and 1 chromolithograph,15 illustrations in text. Original printed wrappers, which are soiled and chipped at the blank edges, mounted on a heavier stock and then newly bound in red cloth with a morocco spine label. Faint marginal dampstain along the lower edge of the first half of the text, with toning. A near very good copy. Item #51932

"Dr. H. W. Vogel discovered in 1873 that dyes added to photographic materials extended their sensitivity to colours other than blue. In 1882 commercial dry plates were produced, and these isochromatic, or orthochromatic, plates soon came into general use. Because they were much more sensitive to blue than green, they were normally exposed through a yellow filter to balance up the exposure. In 1884 Dr. Vogel discovered a method of sensitising plates to orange as well as green light." Coe, Brian, Color Photography: The First Hundred Years, 1840 - 1940, p. 34. These discoveries were fundamental for correct color photography and three-color photography. "Vogel's invention of color sensitizers. By the addition of dyes to silver bromide collodion he obtained practical three-color separation negatives, the results of which he exhibited at the Paris Exposition of 1878." Eder, p. 647.

This title is unique to this French edition, based upon earlier texts by Vogel. Translated into French by Henry Gauthier-Villars, and augmented with notes from the author. The three "photoglypties" are commonly known as Woodburytypes. Roosens and Salu 7664.

Price: $600.00

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