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An Explanation of Digital Photography


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An Explanation of Digital Photography

  1. 1. An Explanation of Digital Photography By Mark W. Decker
  2. 2. Introduction • An avid photographer, Mark W. Decker takes care to understand the mechanisms that work within a camera. Mark W. Decker stands out as a skilled user of many types of digital camera. On a fundamental level, the digital camera works much like a film camera does. Light enters the device through an opening called the aperture, and a lens focuses this light to enable image exposure. Rather than capture this image on traditional film, however, the digital camera transmits the image to a silicone sensor. This sensor consists of millions of small photosites that accumulate an electrical charge based on the level of brightness in the light that it perceives.
  3. 3. Digital Photography • When a photosite receives light, it absorbs photons and releases electrons to a potential well within the sensor. The electrons then collect to generate an electrical charge that converts to a particular analog voltage. After the camera amplifies the total voltage, an A-to-D converter transforms it into a number in binary code. This code gives the camera the instructions that it needs to select brightness and color on corresponding pixels, which combine to form the final image.