History and evolution of photography pdf

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history and evolution of photography pdf

The History of Photography - Nicephore Niepce House Photo Museum

The history of photography began in remote antiquity with the discovery of two critical principles: camera obscura image projection and the observation that some substances are visibly altered by exposure to light. There are no artifacts or descriptions that indicate any attempt to capture images with light sensitive materials prior to the 18th century. Around Johann Heinrich Schulze captured cut-out letters on a bottle of a light-sensitive slurry, but he apparently never thought of making the results durable. Around Thomas Wedgwood made the first reliably documented, although unsuccessful attempt at capturing camera images in permanent form. His experiments did produce detailed photograms , but Wedgwood and his associate Humphry Davy found no way to fix these images.
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The history of photography in 5 minutes

History of photography

The Chinese were among the first to discover the idea of the basic pinhole camera. Around 5th Century B. Is it for the same reason as that when light shines through a rectangular peep-hole, it appears circular in the form of a cone? Disenchanted with silver salts, he turned his attention to light-sensitive organic substances. The process used bitumen, as a coating on glass or metal, which hardened in relation to exposure to light. When the plate was washed with oil of lavender, only the hardened image area remained.

Images were obtained with bitumen of Judea spread on a silver plate after an exposure time of several days. In , they put the last touches, using a residue of lavender oil distillation, by means of a second process producing images in a one day exposure time. A silver plate coated with a very thin silver iodide layer was exposed in a camera obscura, then exposed to mercury vapors that induced the apparition of the invisible latent image that had been formed during the exposure to light. This development was in fact such an amplification of the effect of light that the exposure time was hardly more than 30 minutes. Fixing was done by immersing the plate in sea salted water. In July , another Frenchman, Hippolyte Bayard, discovered the way to obtain positive images directly on paper. A sheet of paper covered with silver chloride was blackened by light, then exposed in a camera obscura after having been sensitized in silver iodide.

General considerations

Photography has come a long way in its relatively short history. In almost years, the camera developed from a plain box that took blurry photos to the high-tech mini computers found in today's DSLRs and smartphones. The story of photography is fascinating and it's possible to go into great detail. However, let's take a brief look at the highlights and major developments of this scientific art form. The basic concept of photography has been around since about the 5th century B.

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By Emily Milam, MD. The history of medical photography is rich and tracks the evolution of both technology and medicine. Its use has been of huge benefit since the more rudimentary days of oral communication, written description, moulage, and hand-drawn illustrations. Throughout its history, it has become a valued adjunct to patient care, research, and education. Photography as we know it today initially began as an exercise in harnessing light using a camera obscura—a device with a pinhole for light entry that projected an inverted image into a dark room or box.

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