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Photograph Preservation
The conservation and restoration of photographs is the study of the physical care and treatment of photographic materials. It covers both efforts undertaken by photograph conservators, librarians, archivists, and museum curators who manage photograph collections at a variety of cultural heritage institutions, as well as steps taken to preserve collections of personal and family photographs. It is an umbrella term that includes both preventative preservation activities such as environmental control and conservation techniques that involve treating individual items. Both preservation and conservation require an in-depth understanding of how photographs are made, and the causes and prevention of deterioration. Conservator-restorers use this knowledge to treat photographic materials, stabilizing them from further deterioration, and sometimes restoring them for aesthetic purposes. While conservation can improve the appearance of a photograph, image quality is not the primary purpose of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photograph Conservator
A photograph conservator is a professional who examines, documents, researches, and treats photographs, including documenting the structure and condition of art works through written and photographic records, monitoring conditions of works in storage and exhibition and transit environments. Well known photograph conservators and projects Some of the most well known Photograph Conservators in the world are: * Paul Messier who received his Masters of Arts and certificate of advanced study in the conservation of works on paper and photographs from the art conservation program at the State University of New York College at Buffalo. He is an independent conservator of photographs in Boston, MA and founded his own studio there in 1994. Paul was recently appointed head of the newly formeLens Media Lab at Yale University Gawain Weaverwho received a B.A. in Art History and Chemistry from Sonoma State University, and an M.A. in Art History and diploma in Conservation from the Institute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albumen Print
The albumen print, also called albumen silver print, was published in January 1847 by Louis Désiré Blanquart-Evrard, and was the first commercially exploitable method of producing a photographic print on a paper base from a negative. It used the albumen found in egg whites to bind the photographic chemicals to the paper and became the dominant form of photographic positives from 1855 to the start of the 20th century, with a peak in the 1860–90 period. During the mid-19th century, the carte de visite became one of the more popular uses of the albumen method. In the 19th century, E. & H. T. Anthony & Company were the largest makers and distributors of albumen photographic prints and paper in the United States.Welling, William. Photography in America (1978 & 1987) Creation process # A piece of paper, usually 100% cotton, is coated with an emulsion of egg white (albumen) and salt (sodium chloride or ammonium chloride), then dried. The albumen seals the paper and creates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Willis (inventor)
William Willis Jr. (1841–1923) is a British inventor who developed the platinum printing process, an early form of photography, based on the light sensitivity of platinum salts, originally discovered by John Herschel. Willis made the first platinum print in 1873 and patented it, but the process was imperfect, attracting little interest. In 1874, the British Journal of Photography announced his Platinum Printing process. It gave a report of the process on 4 June 1875. By 1879 he had improved the process sufficiently to justify founding the Platinotype Company to market his papers. He began marketing his pre-coated papers in 1880. Taking his cue from Daguerre's marketing practices with his Daguerreotypes, Willis sold licenses to photographers wanting to use his process, and then sold them the materials. He lived for many years in Bromley (Kent) and took a considerable interest in the nearby local cottage hospital to which he donated land and funds as well as buying their first X ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platinum Print
Platinum prints, also called ''platinotypes'', are photographic prints made by a monochrome photographic printing, printing process involving platinum. Platinum tones range from warm black, to reddish brown, to expanded mid-tone grays that are unobtainable in silver prints. Unlike the Gelatin silver process, silver print process, platinum lies on the paper surface, while silver lies in a gelatin or Albumen print, albumen emulsion that coats the paper. As a result, since no gelatin emulsion is used, the final platinum image is absolutely Paint sheen#Terminology, matte with a deposit of platinum (and/or palladium, its sister element which is also used in most platinum photographs) absorbed slightly into the paper. Platinum prints are the most durable of all photographic processes. The platinum group metals are very stable against chemical reactions that might degrade the print—even more stable than gold. It is estimated that a platinum image, properly made, can last thousands ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard Leach Maddox
Richard Leach Maddox (4 August 1816 – 11 May 1902) was an English photographer and physician who invented lightweight gelatin negative dry plates for photography in 1871. Early life Richard Leach Maddox was born at Bath, England, on 4 August 1816. Photomicographic studies Long before his discovery of the dry gelatin photographic emulsion, Maddox was prominent in what was called photomicrography - photographing minute organisms under the microscope. The eminent photomicrographer of the day, Lionel S. Beale, included as a frontispiece images made by Maddox in his manual 'How to work with the Microscope' Maddox freely gave his discovery to the world, saying (to W. J. Harrison, in a letter of 1887) that " hadno thought of bringing the subject into notice until it had been lifted from the cradle". Maddox, at the initial stage of invention, could probably produce only 'lantern slides' contact-copied from his microscope plates, the slow speed being impracticable for camera len ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dry Plate
Dry plate, also known as gelatin process, is an improved type of photographic plate. It was invented by Dr. Richard L. Maddox in 1871 and had become so widely adopted by 1879 that the first dry plate factory had been established. With much of the complex chemistry work centralized into a factory, the new process simplified the work of photographers, allowing them to expand their business. Development Gelatin emulsions, as proposed by Maddox, were very sensitive to touch and mechanical friction and were not much more sensitive to light than collodion emulsions. Charles Harper Bennett discovered a method of hardening the emulsion, making it more resistant to friction in 1873. In 1878, Bennett discovered that by prolonged heating, the sensitivity of the emulsion could be greatly increased. George Eastman developed a machine to coat glass plates in 1879 and opened the Eastman Film and Dry Plate Company, reducing the cost of photography. A competitor of Eastman in the development ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Clerk Maxwell
James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish mathematician and scientist responsible for the classical theory of electromagnetic radiation, which was the first theory to describe electricity, magnetism and light as different manifestations of the same phenomenon. Maxwell's equations for electromagnetism have been called the " second great unification in physics" where the first one had been realised by Isaac Newton. With the publication of "A Dynamical Theory of the Electromagnetic Field" in 1865, Maxwell demonstrated that electric and magnetic fields travel through space as waves moving at the speed of light. He proposed that light is an undulation in the same medium that is the cause of electric and magnetic phenomena. (This article accompanied an 8 December 1864 presentation by Maxwell to the Royal Society. His statement that "light and magnetism are affections of the same substance" is at page 499.) The unification of light and electrical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RGB Color Model
The RGB color model is an additive color model in which the red, green and blue primary colors of light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue. The main purpose of the RGB color model is for the sensing, representation, and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography. Before the electronic age, the RGB color model already had a solid theory behind it, based in human perception of colors. RGB is a ''device-dependent'' color model: different devices detect or reproduce a given RGB value differently, since the color elements (such as phosphors or dyes) and their response to the individual red, green, and blue levels vary from manufacturer to manufacturer, or even in the same device over time. Thus an RGB value does not define the same ''color'' across d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tintype
A tintype, also known as a melainotype or ferrotype, is a photograph made by creating a direct positive on a thin sheet of metal coated with a dark lacquer or enamel and used as the support for the photographic emulsion. Tintypes enjoyed their widest use during the 1860s and 1870s, but lesser use of the medium persisted into the early 20th century and it has been revived as a novelty and fine art form in the 21st. Tintype portraits were at first usually made in a formal photographic studio, like daguerreotypes and other early types of photographs, but later they were most commonly made by photographers working in booths or the open air at fairs and carnivals, as well as by itinerant sidewalk photographers. Because the lacquered iron support (there is no actual tin used) was resilient and did not need drying, a tintype could be photographic processing, developed and fixed and handed to the customer only a few minutes after the picture had been taken. The tintype photograph saw mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gum Printing
Gum printing is a way of making photographic reproductions without the use of silver halides. The process uses salts of dichromate in common with a number of other related processes such as sun printing. When mixtures of mucilaginous, protein-containing materials together with soluble salts of dichromate are exposed to ultraviolet light, the protein content becomes tanned and resistant to solution in water. The untanned material can be washed away in warm water leaving a hardened, tanned protein negative. For gum printing a solution of gum arabic is mixed with either potassium or ammonium dichromate. The higher the proportion of dichromate, the more sensitive the mixture. However, increasing the concentration of dichromate also reduces the contrast which is very low at best. The right concentration of dichromate is always a compromise between speed and contrast. Using ammonium dichromate allows concentrations up to 15% of the active ingredient whereas potassium dichromate is limi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frederick Scott Archer
] Frederick Scott Archer (1813 – 1 May 1857) was an English photographer and sculptor who is best known for having invented the photographic collodion process which preceded the modern gelatin emulsion. He was born in either Bishop's Stortford or Hertford, within the county of Hertfordshire, England (United Kingdom of Great Britain and Ireland) and is remembered mainly for this single achievement which greatly increased the accessibility of photography for the general public. Life Scott Archer was the second son of a butcher in Bishops Stortford in Hertfordshire who went to London to take an apprenticeship as a goldsmith and silversmith with a Mr Massey of 116 Leadenhall Street. On the recommendation of Edward Hawkins he trained at the Royal Academy Schools a sculptor and found calotype photography useful as a way of capturing images of his sculptures. Dissatisfied with the poor definition and contrast of the calotype and the long exposures needed, Scott Archer invented the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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