In the 9th century, Arab astronomers became the first to notice the properties of photography. They found that a beam of light reflected from an illuminated object and entering a darkened room through a hole, would project the image upside down.
In 1727, Johann Heinrich Schulze, a German professor of anatomy, discovered that silver nitrate turns dark when exposed to light. The unexposed side remained white. He captured cut-out letters on a bottle of light-sensitive slurry. He was amazed to find that the results were durable.
Thomas Wedgwood, in the early development of photography, managed to produce impermanent images on cloth and white leather.
In the 1820s, the French inventor Nicephore Niepce first managed to get an image that was captured by the first camera ever made. Louis Daguerre, an associate of Niepce, developed the first commercially viable photographic process called daguerreotype. Later, the paper-based calotype negative and salt print process was invented by William Henry Fox Talbot. It was in the 1990s that digital photography was first introduced.
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