I used rawrefinery for with tree net denoise heavy setting.
Further threatment of the DNG in Darktable 5.7.0-+19
I D&S used surface blur and contrast equalizer to reduce the blotches in the unsharp areas
_CTW2287_denoised.dng.xmp (78.3 KB)
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I know your pain 
Also in the last days I have been trying to nail some damselflies and not only are they almost too fast for 1/4000 but the focus must be a few millimeters in depth, unless you use fast bursts itās very hard to get completely in focus imagesā¦ the joys of long focal lengths
Raw Refinery seems in my tests very often better than the implemented nind denoise. Do we have a chance to get @RawRefineryās denoising models to work inside dt as well?
Iām happy to work with people on it, but Iām not an expert on DT.
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It would be great, if @anry would look at this. If I understood it right, the implemented denoising is based on ONNX and you have as well a ONNX version. So maybe it isnāt that hard. But I donāt really have any clue, Iām no coder.
Yeah, I wanted to include ONNX versions for interoperability, but it all depends on how DT handles the raw editing workflow. Perhaps the denoising model could be integrated into the demosaicing step?
At the moment AI denoising in dt works similar to RawRefinery. So it is a Plug-in, which generates a denoised DNG or Tiff and is not really directly implemented in the developing workflow.
Sensors do improve. I shoot my Canon R7 at 32000 ISO and get less noise than this image. But, it is also important to increase the volume of light hitting the senor if possible. To achieve this I usually bracket my exposures and select the brightest image that doesnāt have severe clipping of highlights. This squirrel was shot at 1/1000 of a second. A slower shutter speed would have sufficed and given less noise. Hindsight is just so marvelous 
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What we need is iso bracketing. Constant exposure but iso steps with same aperture and longer shutter speeds.
@RawRefinery if you want to contribute a new model to the registry, please have a look on this document
Actually, adding new model does not require deep knowledge of Darktable, but you need to understand what DT expects as input and output. It is defined by tasks.
I can help you with contribution, if needed.
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True, but slowly
With same parameters, your R7 gets totally defeated by the D850. Sorry to say. Just use the comparision tool I linked above and download the RAWs.
Thatās the point. Colin decided for 1/1000 to avoid motion blur. On the rest he had no influence. I probably would have chosen similar shutterspeed in this situation. Squirrels move quite quickly. If you have still time after the safty shot, you can choose longer exposures. But for me counts: I prefer noise over motion blur.
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Quietly reveals that I had been shooting some pictures of our local ospreys, with shutter speed restricted to 1/1000 or shorter, and I forgot to reset it for this picture 
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I grew up with film. Could you imagine ISO of 32000 or even 14400 on film. So a bit of noise worries me very little. Motion blur I canāt reduce but noise I can tame. I only use AI denoising at low values because I donāt want super smooth.
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You are not alone with that statement. Thatās why I said I prefer noise over motion blur. I can go even further. I prefer noise over a plastic look of a badly AI treated image. I think many of the younger fellows wouldnāt say so.
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I have never done that, so I wonder ā what does it achieve?
Wouldnāt it be enough to do a fast burst with same parameters and take an average to eliminate some noise? (Assuming the squirrel wouldnāt move)
Iām (relatively) of the younger folks here and I absolutely agree with that 
I used to do a lot of denoising which made my photos looks like oil painting, but now I do the default wavelets and call it a day (or even turn off denoising / add grain)
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I think @Fenny meant, this is for having always a safty shot plus some with a longer exposure. So itās not about blending the shots afterwards, but getting one shot with the best combination of shutter speed and ISO.
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Ohh I see, so youād do a quick burst where the camera would be dropping ISO (and compensate with shutter speed) and then you pick one least noisy (and not blurry) photoā¦ Yeah Iām down for that
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squirrel-as-requested_CTW2287.NEF.xmp (29.1 KB)
dt master
Not sure Iāve ever used four instances of denoise before. Think others have done a better job.
EDIT: Ok this picture forced me to come up with a new denoising preset. Thanks!
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