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The Photoshop Lightroom Workbook by Jamie Spritzer, Seth Resnick

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Digital Dictionary

A/D Converter (Analog/Digital Converter)

One of the most important components of the digital camera is the A/D converter. The digital sensor is composed of cells that are light sensitive. The cells capture photons and the image is composited based on the luminance or intensity of the light. More light equals more information. The cell converts light to voltage and generates voltage directly proportional to the intensity of the light.

The voltage is regulated by the A/D converter and the voltage is divided into sections. On one end there is black and the other end is white. As the bit depth increases, there is more separation of values, which provides smoother ranges in light density. Hence, a 14-bit capture is better than a ...

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