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enter image description here So here's a regular denoise node setup. I just learned this recently.

enter image description here

But normally, I wouldn't denoise in the compositor. I would just denoise using Optix by ticking this.

Based on my understanding, the compositor method is better (Please correct me if I'm wrong)

My question is : If I were to denoise in the compositor, would I still have to tick the denoising box?

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No, you don't, as you said yourself, you have 2 options by default: Denoise in render settings or Denoise in composition...

Composition denoise will work if you don't enable denoising in render settings, but it will still work even if you enable it in render settings, you just have to use Noisy Image instead of Image

just to clarify:

If you don't enable denoising in render settings - use Image value for composition If you enable denoising in render settings - use Noisy Image value for composition (this value is only available if you activated denosing)

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  • $\begingroup$ The Noisy Image output is not only available if you enabled denoising (you're talking about "denoising in render settings" here), it is also available along with some more data outputs if you enable Denoising Data under View Layer Properties > Passes > Data. The difference is, if Denoising is enabled in the Render Properties, the Image output will give you an already denoised image as render result, whereas just enabling Denoising Data will have the same output for Image and Noisy Image which makes it necessary to denoise in the Compositor. $\endgroup$
    – Gordon Brinkmann
    Commented Nov 11, 2021 at 11:48
  • $\begingroup$ @SohailNordin Additionally to the answer and my comment: I put up a simple scene which rendered without any denoising enabled in 4.87 seconds. If I enable Denoising, it rendered in 12.28 s. Instead of using the already denoised image but plugging Noisy Image into a Denoise node in compositing, it rendered in 13.83 s, but the result looked much better. $\endgroup$
    – Gordon Brinkmann
    Commented Nov 11, 2021 at 12:19
  • $\begingroup$ @SohailNordin If I disable Denoising and enable Denoising Data so I have to denoise in compositing and use Denoising Normal and Denoising Albedo, the render took only 9.61 s. Just denoising in Compositor without enabling anything the render time was 6.85 s and the result was just as good as the other denoised images (and better as the "directly" denoised image). All in all, the Denoise node in the Compositor works quite good, I always prefer it over the Denoising option in the Render Properties. _Denoising Data I only use sometimes, when the denoise is a bit blurry. $\endgroup$
    – Gordon Brinkmann
    Commented Nov 11, 2021 at 12:24

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