Louis Daguerre

Louis-Jacques-Mandé Daguerre ( 18 November 1787 – 10 July 1851) was a French artist and photographer, recognized for his invention of the daguerreotype process of photography He became known as one of the fathers of photography Though he is most famous for his contributions to photography, he was also an accomplished painter and a developer of the diorama theatre

Louis Daguerre was born in Cormeilles-en-Parisis, Val-d'Oise, France He was apprenticed in architecture, theatre design, and panoramic painting to Pierre Prévost, the first French panorama painter Exceedingly adept at his skill of theatrical illusion, he became a celebrated designer for the theatre, and later came to invent the diorama, which opened in Paris in July 1822

In 1829, Daguerre partnered with Nicéphore Niépce, an inventor who had produced the world's first heliograph in 1822 and the oldest surviving camera photograph in 1826 or 1827 Niépce died suddenly in 1833, but Daguerre continued experimenting, and evolved the process which would subsequently be known as the daguerreotype After efforts to interest private investors proved fruitless, Daguerre went public with his invention in 1839 At a joint meeting of the French Academy of Sciences and the Académie des Beaux Arts on 7 January of that year, the invention was announced and described in general terms, but all specific details were withheld Under assurances of strict confidentiality, Daguerre explained and demonstrated the process only to the Academy's perpetual secretary François Arago, who proved to be an invaluable advocate Members of the Academy and other select individuals were allowed to examine specimens at Daguerre's studio The images were enthusiastically praised as nearly miraculous, and news of the daguerreotype quickly spread Arrangements were made for Daguerre's rights to be acquired by the French Government in exchange for lifetime pensions for himself and Niépce's son Isidore; then, on 19 August 1839, the French Government presented the invention as a gift from France "free to the world", and complete working instructions were published In 1839, he was elected to the National Academy of Design as an Honorary Academician

Daguerre died on 10 July 1851 in Bry-sur-Marne, 12 km (7 mi) from Paris A monument marks his grave there

Daguerre's name is one of the 72 names inscribed on the Eiffel tower

In the mid-1820s, prior to his association with Daguerre, Niépce used a coating of bitumen of Judea to make the first permanent camera photographs The bitumen was hardened where it was exposed to light and the unhardened portion was then removed with a solvent A camera exposure lasting for hours or days was required Niépce and Daguerre later refined this process, but unacceptably long exposures were still needed

After the death of Niépce in 1833, Daguerre concentrated his attention on the light-sensitive properties of silver salts, which had previously been demonstrated by Johann Heinrich Schultz and others For the process which was eventually named the daguerreotype, he exposed a thin silver-plated copper sheet to the vapor given off by iodine crystals, producing a coating of light-sensitive silver iodide on the surface The plate was then exposed in the camera Initially, this process, too, required a very long exposure to produce a distinct image, but Daguerre made the crucial discovery that an invisibly faint "latent" image created by a much shorter exposure could be chemically "developed" into a visible image Upon seeing the image, the contents of which are unknown, Daguerre said, "I have seized the light – I have arrested its flight!"

The latent image on a daguerreotype plate was developed by subjecting it to the vapor given off by mercury heated to 75 °C The resulting visible image was then "fixed" (made insensitive to further exposure to light) by removing the unaffected silver iodide with concentrated and heated salt water Later, a solution of the more effective "hypo" (hyposulphite of soda, now known as sodium thiosulfate) was used instead

The resultant plate produced an exact reproduction of the scene The image was laterally reversed—as images in mirrors are—unless a mirror or inverting prism was used during exposure to flip the image To be seen optimally, the image had to be lit at a certain angle and viewed so that the smooth parts of its mirror-like surface, which represented the darkest parts of the image, reflected something dark or dimly lit The surface was subject to tarnishing by prolonged exposure to the air and was so soft that it could be marred by the slightest friction, so a daguerreotype was almost always sealed under glass before being framed (as was commonly done in France) or mounted in a small folding case (as was normal in the UK and US)

Daguerreotypes were usually portraits; the rarer landscape views and other unusual subjects are now much sought-after by collectors and sell for much higher prices than ordinary portraits At the time of its introduction, the process required exposures lasting ten minutes or more for brightly sunlit subjects, so portraiture was an impractical ordeal Samuel Morse was astonished to learn that daguerreotypes of the streets of Paris did not show any people, horses or vehicles, until he realized that due to the long exposure times all moving objects became invisible Within a few years, exposures had been reduced to as little as a few seconds by the use of additional sensitizing chemicals and "faster" lenses such as Petzval's portrait lens, the first mathematically calculated lens

The daguerreotype was the Polaroid film of its day: it produced a unique image which could only be duplicated by using a camera to photograph the original Despite this drawback, millions of daguerreotypes were produced The paper-based calotype process, introduced by Henry Fox Talbot in 1841, allowed the production of an unlimited number of copies by simple contact printing, but it had its own shortcomings—the grain of the paper was obtrusively visible in the image, and the extremely fine detail of which the daguerreotype was capable was not possible The introduction of the wet collodion process in the early 1850s provided the basis for a negative-positive print-making process not subject to these limitations, although it, like the daguerreotype, was initially used to produce one-of-a-kind images—ambrotypes on glass and tintypes on black-lacquered iron sheets—rather than prints on paper These new types of images were much less expensive than daguerreotypes, and they were easier to view By 1860 few photographers were still using Daguerre's process

The same small ornate cases commonly used to house daguerreotypes were also used for images produced by the later and very different ambrotype and tintype processes, and the images originally in them were sometimes later discarded so that they could be used to display photographic paper prints It is now a very common error for any image in such a case to be described as "a daguerreotype" A true daguerreotype is always an image on a highly polished silver surface, usually under protective glass If it is viewed while a brightly lit sheet of white paper is held so as to be seen reflected in its mirror-like metal surface, the daguerreotype image will appear as a relatively faint negative—its dark and light areas reversed—instead of a normal positive Other types of photographic images are almost never on polished metal and do not exhibit this peculiar characteristic of appearing positive or negative depending on the lighting and reflections
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