When manually reducing Noise (not using AI tools), it would be helpful if we had a masking slider similer to what we have when manually using the Sharpening sliders, but reversed in application (holding down the Alt/Cmd key). While using the noise reduction sliders, holding down the Alt/Cmd key white would show for areas in the image with low detail and black with areas of high detail. Recognizing that darker areas are more likely to need noise reduction, perhaps there needs to be two masking sliders, one for detail levels and the other for illuminosity levels.
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