Why is webcam video grainier and fuzzier when the room is dark?
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Light is (or carries) information. So no light is no information, a little light gives a little information, a lot of light gives a lot of information (information on the frequency of the objects light spectrum to be more specific).
Cameras (the technology) operate more efficiently with more information (for obvious reasons). Really good cameras can provide quality images with less “information”.
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