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Old 28th May 2020, 01:45   #5  |  Link
Asmodian
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Join Date: Feb 2002
Location: San Jose, California
Posts: 4,406
Quote:
Originally Posted by MysteryX View Post
The information is much more grossian and thus much less noise. It would in fact just blur it out further?
I think this is the most significant reason.

(You meant Gaussian I assume? It is not really Gaussian, that is a particular shape, but that is getting pedantic; you meant it is smooth and low detail, like video after a gaussian blur, which is true).

Then even if there is some noise humans are bad at noticing chroma noise.

Also performance considerations, all the above is true and then on top of that it takes a lot of CPU time to work on. All in all it is almost never worth it but weird sources always exist. For example, if over compressed there can be compression artifacts in the chroma planes, these are usually better handled by deblocking the chroma not denoising it, but there can still be reasons to do it.
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