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1 Ducos du Hauron, Arthur-Louis
SUBJECT AREA: Photography, film and optics[br]b. 1837 Langon, Bordeaux, Franced. 19 August 1920 Agen, France[br]French scientist and pioneer of colour photography.[br]The son of a tax collector, Ducos du Hauron began researches into colour photography soon after the publication of Clerk Maxwell's experiment in 1861. In a communication sent in 1862 for presentation at the Académie des Sciences, but which was never read, he outlined a number of methods for photography of colours. Subsequently, in his book Les Couleurs en photographie, published in 1869, he outlined most of the principles of additive and subtractive colour photography that were later actually used. He covered additive processes, developed from Clerk Maxwell's demonstrations, and subtractive processes which could yield prints. At the time, the photographic materials available prevented the processes from being employed effectively. The design of his Chromoscope, in which transparent reflectors could be used to superimpose three additive images, was sound, however, and formed the basis of a number of later devices. He also proposed an additive system based on the use of a screen of fine red, yellow and blue lines, through which the photograph was taken and viewed. The lines blended additively when seen from a certain distance. Many years later, in 1907, Ducos du Hauron was to use this principle in an early commercial screen-plate process, Omnicolore. With his brother Alcide, he published a further work in 1878, Photographie des Couleurs, which described some more-practical subtractive processes. A few prints made at this time still survive and they are remarkably good for the period. In a French patent of 1895 he described yet another method for colour photography. His "polyfolium chromodialytique" involved a multiple-layer package of separate red-, green-and blue-sensitive materials and filters, which with a single exposure would analyse the scene in terms of the three primary colours. The individual layers would be separated for subsequent processing and printing. In a refined form, this is the principle behind modern colour films. In 1891 he patented and demonstrated the anaglyph method of stereoscopy, using superimposed red and green left and right eye images viewed through green and red filters. Ducos du Hauron's remarkable achievement was to propose theories of virtually all the basic methods of colour photography at a time when photographic materials were not adequate for the purpose of proving them correct. For his work on colour photography he was awarded the Progress Medal of the Royal Photographic Society in 1900, but despite his major contributions to colour photography he remained in poverty for much of his later life.[br]Further ReadingB.Coe, 1978, Colour Photography: The First Hundred Years, London. J.S.Friedman, 1944, History of Colour Photography, Boston. E.J.Wall, 1925, The History of Three-Colour Photography, Boston. See also Cros, Charles.BCBiographical history of technology > Ducos du Hauron, Arthur-Louis
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2 Ives, Frederic Eugene
SUBJECT AREA: Photography, film and optics[br]b. 17 February 1856 Litchfield, Connecticut, USAd. 27 May 1937 Philadelphia, Pennsylvania, USA[br]American printer who pioneered the development of photomechanical and colour photographic processes.[br]Ives trained as a printer in Ithaca, New York, and became official photographer at Cornell University at the age of 18. His research into photomechanical processes led in 1886 to methods of making halftone reproduction of photographs using crossline screens. In 1881 he was the first to make a three-colour print from relief halftone blocks. He made significant contributions to the early development of colour photography, and from 1888 he published and marketed a number of systems for the production of additive colour photographs. He designed a beam-splitting camera in which a single lens exposed three negatives through red, green and blue filters. Black and white transparencies from these negatives were viewed in a device fitted with internal reflectors and filters, which combined the three colour separations into one full-colour image. This device was marketed in 1895 under the name Kromskop; sets of Kromograms were available commercially, and special cameras, or adaptors for conventional cameras, were available for photographers who wished to take their own colour pictures. A Lantern Kromskop was available for the projection of Kromskop pictures. Ives's system enjoyed a few years of commercial success before simpler methods of making colour photographs rendered it obsolete. Ives continued research into colour photography; his later achievements included the design, in 1915, of the Hicro process, in which a simple camera produced sets of separation negatives that could be printed as dyed transparencies in complementary colours and assembled in register on paper to produce colour prints. Later, in 1932, he introduced Polychrome, a simpler, two-colour process in which a bipack of two thin negative plates or films could be exposed in conventional cameras. Ives's interest extended into other fields, notably stereoscopy. He developed a successful parallax stereogram process in 1903, in which a three-dimensional image could be seen directly, without the use of viewing devices. In his lifetime he received many honours, and was a recipient of the Royal Photographic Society's Progress Medal in 1903 for his work in colour photography.[br]Further ReadingB.Coe, 1978, Colour Photography: The First Hundred Years, London J.S.Friedman, 1944, History of Colour Photography, Boston. G.Koshofer, 1981, Farbfotografie, Vol. I, Munich.E.J.Wall, 1925, The History of Three-Colour Photography, Boston.BC -
3 Cros, Charles
SUBJECT AREA: Photography, film and optics[br]b. 1842 Franced. 1888[br]French doctor, painter and man of letters who pioneered research into colour photography.[br]A man of considerable intellect, Cros occupied himself with studies of topics as diverse as Sanskrit and the synthesis of precious stones. He was in particular interested in the possibility of colour photography, and deposited an account of his theories in a sealed envelope with the Académie des Sciences on 2 December 1867, with instructions that it should be opened in 1876. Learning of a forthcoming presentation on colour photography by Ducos du Hauron at the Société Française de Photographie, he arranged for the contents of his communication to be published on 25 February 1869 in Les Mondes. At the Société's meeting on 7 May 1869, Cros's letter was read and samples of colour photography from Ducos du Hauron were shown. Both had arrived at similar conclusions: that colour photography was possible with the analysis of colours using negatives exposed through red, green and blue filters, as demonstrated by Clerk Maxwell in 1861. These records could be reproduced by combining positive images produced in blue-green, magenta and yellow pigments or dyes. Cros and Ducos du Hauron had discovered the principle of subtractive colour photography, which is used in the late twentieth century. In 1878 Cros designed the Chromometre, a device for measuring colours by mixing red, green and blue light, and described the device in a paper to the Société Française de Photographie on 10 January 1879. With suitable modification, the device could be used as a viewer for colour photographs, combining red, green and blue positives. In 1880 he patented the principle of imbibition printing, in which dye taken up by a gelatine relief image could be transferred to another support. This principle, which he called hydrotypie, readily made possible the production of three-colour subtractive photographic prints.[br]Further ReadingJ.S.Friedman, 1944, History of Colour Photography, Boston. Gert Koshofer, 1981, Farbefotografie, Vol. I, Munich.BC -
4 Blanquart-Evrard, Louis-Désiré
SUBJECT AREA: Photography, film and optics[br]b. 2 August 1802 Lille, Franced. 28 April 1872 Lille, France[br]French photographer, photographic innovator and entrepreneur.[br]After beginning his working life in a tobacco company, Blanquart-Evrard became Laboratory Assistant to a chemist. He also became interested in painting on ivory and porcelain, foreshadowing a life-long interest in science and art. Following his marriage to the daughter of a textile merchant, Blanquart-Evrard became a partner in the family business in Lyon. During the 1840s he became interested in Talbot's calotype process and found that by applying gallic acid alone, as a developing agent after exposure, the exposure time could be shorter and the resulting image clearer. Blanquart-Evrard recognized that his process was well suited to producing positive prints in large numbers. During 1851 and 1852, in association with an artist friend, he became involved in producing quantities of prints for book illustrations. In 1849 he had announced a glass negative process similar to that devised two years earlier by Niepcc de St Victor. The carrying agent for silver salts was albumen, and more far-reaching was his albumen-coated printing-out paper announced in 1850. Albumen printing paper was widely adopted and the vast majority of photographs made in the nineteenth century were printed in this form. In 1870 Blanquart-Evrard began an association with the pioneer colour photographer Ducos du Hauron with a view to opening a three-colour printing establishment. Unfortunately plans were delayed by the Franco-Prussian War, and Blanquart-Evrard died in 1872 before the project could be brought to fruition.[br]Bibliography1851, Traité de photographie sur papier, Paris (provides details of his improvements to Talbot's process).Further ReadingJ.M.Eder, 1945, History of Photography, trans. E. Epstein, New York.JWBiographical history of technology > Blanquart-Evrard, Louis-Désiré
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5 Ives, Herbert Eugene
[br]b. 1882 USAd. 1953[br]American physicist find television pioneer.[br]Ives gained his PhD in physics from Johns Hopkins University, Baltimore, Maryland, and subsequently served in the US Signal Corps, eventually gaining experience in aerial photography. He then joined the Western Electric Engineering Department (later Bell Telephone Laboratories), c.1920 becoming leader of a group concerned with television-image transmission over telephone lines. In 1927, using a Nipkow disc, he demonstrated 50-line, 18 frames/sec pictures that could be displayed as either 2 in.×2 1/2 in. (5.1 cm×6.4 cm) images suitable for a "wirephone", or 2 ft ×2 1/2 ft (61 cm×76 cm) images for television viewing. Two years later, using a single-spiral disc and three separately modulated light sources, he was able to produce full-colour images.[br]Bibliography1915, "The transformation of colour mixture equations", Journal of the Franklin Institute 180:673.1923, "do—Pt II", Journal of the Franklin Institute 195–23.1925, "Telephone picture transmission", Transactions of the Society of Motion Picture and Television Engineers 23:82.1929, "Television in colour", Bell Laboratories Record 7:439.1930, with A.L.Johnsrul, "Television in colour by a beam-scanning method", Journal of the Optical Society of America 20:11.Further ReadingJ.H.Udelson, 1982, The Great Television Race: History of the Television Industry 1925– 41: University of Alabama Press.KF
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