Image perturbation caused by electronic transformation and processing.
To learn what can cause noise, see "What types of noise can be present in digital photographs?"
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Is it true that "only photographers care about noise"?Why would using higher ISO and faster shutter speed yield more noise than using lower ISO and slower shutter speed?
Multiple copies of the same exposure, but randomizing the noise?
Signal to Noise Ratio over the years
Why is the North America Nebula so hard to see on this astrophoto?
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