Quote:
Originally Posted by Ari
(extra nerding, noise reduction is just really complex applications of the Fourier transform, because of this aggressive noise reduction can remove wanted periodic elements like film grain or skin texture or other patterns.)
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Really there is no such thing as noise reduction because noise is in the eye of the beholder. There are various kinds of image filtering methods depending on which features you want to keep and which not. (edges, corners, etc.) Film grain is as close as you can get to statistical noise as it makes sense.