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c. 1800 - Thomas Wedgwood conceives of making permanent pictures of camera images by using a durable surface coated with a light-sensitive chemical. He succeeds only in producing silhouettes and other shadow images, and is unable to make them permanent.
1816 - Nicéphore Niépce succeeds in making negative photographs of camera images on paper coated with silver chloride, but cannot adequately "fix" them to stop them from darkening all over when exposed to light for viewing.
1824 - Nicéphore Niépce makes the first durable, light-fast camera photograph, similar to his surviving 1826-1827 photograph on pewter but created on the surface of a lithographic stone. It is destroyed in the course of subsequent experiments.
1834 - Hércules Florence, a French-Brazilian painter and the isolate inventor of photography in Brazil, coined the word photographie for his technique, at least four years before John Herschel coined the English word photography.
1835 - Henry Fox Talbot produces durable silver chloride camera negatives on paper and conceives the two-step negative-positive procedure used in most non-electronic photography up to the present.
1839 - Louis Daguerre publicly introduces his daguerreotype process, which produces highly detailed permanent photographs on silver-plated sheets of copper. At first, it requires several minutes of exposure in the camera, but later improvements reduce the exposure time to a few seconds. Photography suddenly enters the public consciousness and Daguerre's process is soon being used worldwide.
1839 - Henry Fox Talbot publicly introduces the paper-based process he worked out in 1835, calling it "photogenic drawing", but it requires much longer exposures than the daguerreotype and the results are not as clear and detailed.
1839 - Hippolyte Bayard presents the first public exhibition of photographs. He claims to have invented a photographic process prior to Daguerre and Talbot.
1839 - Sarah Anne Bright creates a series of photograms, six of which are known to still exist. These are the earliest surviving photographic images created by a woman.
1839 - John Herschel introduces hyposulfite of soda (now known as sodium thiosulfate but still nicknamed "hypo") as a highly effective fixer for all silver-based processes. He also makes the first glass negative.
1841 - Henry Fox Talbot introduces his patented calotype (or "talbotype") paper negative process, an improved version of his earlier process that greatly reduces the required exposure time.
1848 - Edmond Becquerel makes the first full-color photographs, but they are only laboratory curiosities: an exposure lasting hours or days is required and the colors are so light-sensitive that they sometimes fade right before the viewer's eyes while being examined.
1854 - André-Adolphe-Eugène Disdéri credited with introduction of the carte de visite (English: visiting card or calling card) format for portraiture. Disdéri uses a camera with multiple lenses that can photograph eight different poses on one large negative. After printing on albumen paper, the images are cut apart and glued to calling-card-size mounts.
1861 - James Clerk Maxwell presents a projected additive color image of a multicolored ribbon, the first demonstration of color photography by the three-color method he suggested in 1855. It uses three separate black-and-white photographs taken and projected through red, green and blue color filters. The projected image is temporary but the set of three "color separations" is the first durable color photograph.
1868 - Louis Ducos du Hauron patents his numerous ideas for color photography based on the three-color principle, including procedures for making subtractive color prints on paper. They are published the following year. Their implementation is not technologically practical at that time, but they anticipate most of the color processes that are later introduced.
1873 - Hermann Wilhelm Vogel discovers dye sensitization, allowing the blue-sensitive but otherwise color-blind photographic emulsions then in use to be made sensitive to green, yellow and red light. Technical problems delay the first use of dye sensitization in a commercial product until the mid-1880s; fully panchromatic emulsions are not in common use until the mid-20th century.
1876 - Hurter & Driffield begin systematic evaluation of sensitivity characteristics of photographic emulsions -- the science of sensitometry.
1878 - Heat ripening of gelatin emulsions is discovered. This greatly increases sensitivity and makes possible very short "snapshot" exposures.
1878 - Eadweard Muybridge uses a row of cameras with trip-wires to make a high-speed photographic analysis of a galloping horse. Each picture is taken in less than the two-thousandth part of a second, and they are taken in sufficiently rapid sequence (about 25 per second) that they constitute a brief real-time "movie" that can be viewed by using a device such as a zoetrope, a photographic "first".
1902 - Arthur Korn devises practical telephotography technology (reduction of photographic images to signals that can be transmitted by wire to other locations).Wire-Photos are in wide use in Europe by 1910, and transmitted to other continents by 1922.
1907 - The Autochrome plate is introduced. It becomes the first commercially successful color photography product.
1908 - Kinemacolor, a two-color process known as the first commercial "natural color" system for movies, is introduced.
1909 - Kodak announces a 35 mm "safety" motion picture film on an acetate base as an alternative to the highly flammable nitrate base. The motion picture industry discontinues its use after 1911 due to technical imperfections.
1925 - The Leica introduces the 35 mm format to still photography.
1926 - Kodak introduces its 35 mm Motion Picture Duplicating Film for duplicate negatives. Previously, motion picture studios used a second camera alongside the primary camera to create a duplicate negative.
^ abc"The First Photograph - Heliography". Archived from the original on 2009-10-06. Retrieved . from Helmut Gernsheim's article, "The 150th Anniversary of Photography," History of Photography, Vol. I, No. 1, January 1977: ... In 1822, Niépce coated a glass plate ... The sunlight passing through ... This first permanent example ... was destroyed ... some years later.
^This date is commonly misreported as 1725 or 1727, an error deriving from the belief that a 1727 publication of Schulze's account of experiments he says he undertook about two years earlier is the original source. In fact, it is a reprint of a 1719 publication and the date of the experiments is therefore circa 1717. The dated contents page of the true original can be seen hereArchived 2015-02-21 at the Wayback Machine. (retrieved 2015-02-21)