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Real World Digital Photography, 2nd edition by Tim Grey, Seán Duggan, Katrin Eismann

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The Imaging Sensor

Film does the job of both recording and storing the image photographed. With digital cameras these jobs are split between the imaging sensor and digital media (we'll talk about digital media later in this chapter). The imaging sensor replaces film as the recording medium. The sensor consists of millions of individual light-sensitive pixels. These pixels effectively translate the light into specific voltage values. This process is called analog to digital conversion—or in geek speak, A to D conversion. The voltage information that has been translated to discrete digital numbers represents the tonal and color values in the photographic image.

Even though digital cameras take pictures in full color, the sensors are unable to see ...

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