I’ve searched around a bit, but haven’t come up with any search terms that have found me an answer.
I see that with the experimental feature set enabled, I can enable a render layer’s “denoising” pass, and save all of the information used by the denoiser, presumably for later use. I’d assume this means that you can render once, and then feed the results of that render into the denoiser, to try out different denoising settings, without having to re-render each time.
But in the blender interface and on the internet in general, I haven’t found anything suggesting that this is possible. Is it? Is it perhaps a planned feature for the future? It would be really handy to be able to denoise in a separate post-processing step, to more easily experiment without having to completely re-render everything.