I usually only filter chroma noise. I find that denoise (profiled) can suppress it very effectively, leaving fine-grained luma noise behind. I've exported my preset, you can grab it here if you like: https://tech.kovacs-telekes.org/files/denoiseprofile_wavelet chroma.dtpreset You can import it with Preferences -> Presets -> import, see https://www.darktable.org/usermanual/en/preferences-settings/presets/
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