Why is webcam video grainier and fuzzier when the room is dark?
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so. you have aperture (the size of the hole that lets in light), shutter speed (how long the hole stays open), and ISO (some magic thing that defines how sensitive your sensor is to light. you can adjust any of those three to affect your image. you can mix and match adjustments and have the same “brightness image’.
web cams, have tiny apertures, medium speed shutter speeds, so it needs a lot of time to let in a lot of light for it to be clear at night (but this would cause a lot of motion blur). so your shutter speed is fixed, your aperture is tiny, so you increase the ISO (which creates noise because you have a tiny sensor as well).
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