Photography is a word derived from the Greek words photos (“light”) and graphein (“to draw”). The word was first used by the scientist Sir John F.W. Herschel in 1839. It is a method of recording images by the action of light or related radiation onto a sensitive material.
Alhazen (Ibn Al-Haytham) was a great authority on optics in the Middle Ages who lived around 1000AD. He invented the first pinhole camera (also called the Camera Obscura} and was able to explain why the images were upside down.
The first casual reference to the optic laws that made pinhole cameras possible was observed and noted by Aristotle around 330 BC. He questioned why the sun could make a circular image when it shined through a square hole.
The First Photograph
On a summer day in 1827, Joseph Nicephore Niepce developed the first photographic image with a camera obscura.
Prior to Niepce, people just used the camera obscura for viewing or drawing purposes, not for making photographs. By letting light draw the picture, Niepce’s heliographs, or sun prints as they were called, were the prototype for the modern photograph.
Niepce placed an engraving onto a metal plate coated in bitumen and then exposed it to light. The shadowy areas of the engraving blocked light, but the whiter areas permitted light to react with the chemicals on the plate. When Niepce placed the metal plate in a solvent, gradually an image, until then invisible, appeared. However, Niepce’s photograph required eight hours of light exposure to create and would soon fade away.
Fellow Frenchman, Louis Daguerre was also experimenting with ways to capture an image, but it would take him another dozen years before Daguerre was able to reduce exposure time to less than 30 minutes and keep the image from disappearing afterwards.
Daguerre was the inventor of the first practical process of photography. In 1829, he formed a partnership with Niepce to improve the process Niepce had developed. In 1839, following several years of experimentation and Niepce’s death, Daguerre developed a more convenient and effective method of photography and named it after himself.
Daguerre’s daguerreotype process started by fixing the images onto a sheet of silver-plated copper. He then polished the silver and coated it in iodine, creating a surface that was sensitive to light. Then, he put the plate in a camera and exposed it for a few minutes. After the image was painted by light, Daguerre bathed the plate in a solution of silver chloride. This process created a lasting image that would not change if exposed to light.
In 1839, Daguerre and Niepce’s son sold the rights for the daguerreotype to the French government and published a booklet describing the process. The daguerreotype gained popularity quickly and by 1850, there were over seventy daguerreotype studios in New York City alone.
Negative to Postive Process
The inventor of the first negative from which multiple positive prints were made was Henry Fox Talbot, an English botanist, mathematician and a contemporary of Daguerre.
Talbot sensitized paper to light using a silver salt solution. He then exposed the paper to light. The background became black and the subject was rendered in gradations of grey. This was a negative image. And from the paper negative, Talbot made contact prints, reversing the light and shadows to create a detailed picture. In 1841, he perfected this paper-negative process and called it a calotype, Greek for beautiful picture.
Tintypes, patented in 1856 by Hamilton Smith, was another medium that heralded the birth of photography. A thin sheet of iron was used to provide a base for light-sensitive material, yielding a positive image.
Wet Plate Negatives
In 1851, Frederick Scoff Archer, an English sculptor, invented the wet plate negative. Using a viscous solution of collodion, he coated glass with light-sensitive silver salts. Because it was glass and not paper, this wet plate created a more stable and detailed negative.
Photography advanced considerably once sensitized materials could be coated on plate glass. However, wet plates had to be developed quickly before the emulsion dried. In the field, this meant carrying along a portable darkroom.
Dry Plate Negatives & Hand-held Cameras
In 1879, the dry plate was invented, a glass negative plate with a dried gelatin emulsion. Dry plates could be stored for a period of time. This meant photographers no longer needed portable darkrooms and could now hire technicians to develop their photographs. Dry processes absorbed light so rapidly that the hand-held camera was now possible.
Flexible Roll Film
In 1889, George Eastman invented film with a base that was flexible, unbreakable and could be rolled. Emulsions coated on a cellulose nitrate film base, such as Eastman’s, made the mass-produced box camera a reality.
In the early 1940s, commercially viable color films (except Kodachrome) were brought to the market. These films used the modern technology of dye-coupled colors in which a chemical process connects
the three dye layers together to create an apparent color image.
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