Digital photo noise reduction by calibration
The core of this technique is to take a black frame (with the lens cap or a dark towel over the lens) at exactly the same ISO and exposure time settings, then subtract that frame from your image. This should give you a much clearer image with much less noise. This technique has been floating around for a while, but this is a very clear description of the process, plus a very strong background explanation of why it works and what kinds of noise it doesn’t fix.
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