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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.sstatic.net/mwowD.png $\endgroup$
    – susu
    Commented Sep 9, 2020 at 20:23
  • $\begingroup$ Thanks for the update, and also for improving the answer :). $\endgroup$
    – jachym michal
    Commented Sep 10, 2020 at 6:03

1 Answer 1

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The Noisy Image output is meant for the Denoise node.
But with very low samples, the Image output may give better results.



Image output

  • this output comes pre-denoised by the Internal denoiser, if it's enabled
  • this may lead to some lost detail if it's then denoised egain

enter image description here



Noisy Image output

  • this is the intended output for the Denoise node
  • the output has been Despeckled to remove fireflies
  • however this may cause bad shadow artifacts for extra 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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