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After enabling Denoising Data pass, there are now two image outputs:

  • Image
  • Noisy Image

Which should I use with the Denoise node? Blender Manual doesn't cover it.

enter image description here

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    $\begingroup$ Note that the options to enable denoising have moved in 2.9 i.stack.imgur.com/mwowD.png $\endgroup$ – susu Sep 9 '20 at 20:23
  • $\begingroup$ Thanks for the update, and also for improving the answer :). $\endgroup$ – Jachym Michal Sep 10 '20 at 6:03
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When in doubt, use the Image pass.

Image

  • provides unmodified render result
  • output also comes denoised by the Internal denoiser if it's enabled

enter image description here

Noisy Image

  • provides a Despeckled image (useful when render has fireflies)
  • may cause bad shadow artifacts for low sample counts

enter image description here

Further Reading:
Denoise node in Blender Manual

How to use Intel denoiser in Blender

Blenderartists.org discussion from Aug 2019

intel openimage denoise

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