Computer Operating Systems
A brief history of digital photography
Throughout history, man has attempted to record his exploits for whatever reason or occasion. These early attempts were simple carvings or drawings that can be found throughout the world. Contrary to what many believe, the concept of capturing an image as the world has come to know it is not a process that is relatively new. The basic ideas have been around for centuries. "An Arab, Alhazen of Basra, observed sometime in the, tenth century at light passing through a small round hole, perhaps in a tent flap or wall, would create an image of the outdoor scene on an interior wall or screen. He used this to obese eclipses of the sun. Many others, including Aristotle, had observed, this optical phenomenon, which was later used in what the Italians called the camera obscura (literally dark room). From this we got our word camera." (Rhode, 1)
Even though the basic elements of capturing light and image was in the hands of early man, it was centuries before the light image was able to be saved without the need for paints or carvings. "By 1700 the portable camera obscura had become standard equipment for many professional artists who etched image the lens cast on the ground glass. No one knew of any popular method of recording the image. Then, in 1727, Johann Heinrich Schulze, a German university professor, revealed that he had discovered that the blackening of silver salts (such as silver iodide, silver, bromide, and silver chloride), observed by others before him, was caused by light, not by heat or air. Thus the two basic steps needed for the development of photography were known: light could be used to cast an image on silver salts that would be chemically changed by the light, thereby recording the image. But a century more elapsed before anyone successfully created a permanent image with the...