So what I do is start with that (standalone, not as a plugin), let it do its thing, and then export as a DNG. However, I agree with that with Topaz DenoiseAI you can get excellent NR results right away (and nice sharpening too!). But note again that this was just a first minor NR, plus whatever lens corrections, etc that the RAW editor would do. So I would just use it for some initial NR and that was about all, exporting a 16-bit TIF. I had found in the past that Olympus OWS did the best initial NR (yes, better than RawTherapee). This mania for using RAW editors to do everything seems to have started when Lightroom got good enough to serve that way, but I personally think it is better to just do intial processing on the RAW and use a full editor and plugins to finish the task. I don't think that this is a bad general strategy. This had been the regular Topaz Denoise (no "AI"). I would then edit the TIF in my regular editor and use whatever NR software I liked at the time. So I would NOT attempt to get anywhere near the full NR seen in the OOC jpgs when I exported my raw images out of whatever software I used (as a 16-bit TIF). But until I started using Topaz DenoiseAI, I only thought of RAW noise reduction as the first step in the noise reduction process. I use Topaz which I can warmly recommend but I have seen many other brands delivering fairly equal results so if you find one on sale just go for it. If there is a single editing tool worth purchasing, that's AI denoise. That being said, I will never even bother using legacy denoise on m4/3 images beyond ISO 400 because AI denoise can do miracles up to ISO 1600 or so and after ISO 400 there is so much noise that legacy NR just can't remove it without removing fine details as well. I have not used RawTherapee that much but no matter how much I play with the settings, result is always a far cry from what I get by just clicking Darktable Denoise (profiled) on. RawTherapee has actually three denoise modules "Impulse Noise", "Denoise" and "Hot/dead pixels" and especially Denoise has a ridiculous number of different settings. non-AI denoise ever gets without having to touch any of the settings. Just click Darktable "Denoise (profiled)" ON and result is just as good as legacy i.e. There is one thing where the other free editing SW - Darktable - is infinitely better at least in usability and it's noise reduction.
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