Hi everybody, after some months it’s time to show that I can finish what I start, or continue it for a while at least.
Also the official Darktable forum is on, but it has an “unofficial” Reddit community with 2500+ members and a lot of useful posts. Once you do that, then you can compare noise reduction and see which version is really more flat.Please note that the official Rawtherapee forum is on, as said in the description of the subreddit community and mine is an UNOFFICIAL guide to use Rawtherapee. Spot-check pixel values to make sure they match between both programs. The PP3 I downloaded from the first post has exposure compensation set to +1EV, flat tone curves and it does not use a DCP input profile with tone curve - that alone means you are not comparing apples to apples. LR’s neutral uses a s-shaped tone curve, RT’s neutral is really neutral. Specifically you should set LR to neutral, then set exposure compensation in RawTherapee to match LR, and then use a tone curve to finalize look.
If you want to compare noise reduction and make statements that the output from one program looks more flat than another, then you should first make both programs handle the image as similarly as possible. It is not a two-slider solution like LR and takes some experiment to get there, but you can save all these in a preset and then just adjust the luminance detail slider for different images. I think the result should be fairly close to Lightroom now. Finally, I used Edge Sharpness in the Wavelet tool to sharpen the edges, along with edge detection to avoid sharpening the noise. Next, I turn on Impulse Noise Reduction with threshold 75 to further remove noise in the darker areas, and enabled Microcontrast to bring out the really fine details that were lost from all those NR.
Raw noise reduction rawtherapee iso#
I find this much more effective at combating high ISO images and now you only end up with one slider to control the noise/detail ratio. The trick here is setting the Luminance slider to 100, and then raising the Luminance Detail slider to bring back some details. With all the color noise gone, we can deal with the difficult part: luminance noise. You will probably notice some random 1~2 pixel-wide colorful blobs left in the image if you pixel peep this is eliminated with a Chroma Only 5x5 3-iteration median filter. This should be the two click solution to deal with 95% of the color noises on almost any RAW images, and it is also very aggressive, so I lowered the Chrominance Curve quite a bit to avoid destroying the colors. I always deal with the chromatic noise first, and a good starting point is using the Automatic Global method with Quality set to High. So I tried to bring the overall lightness in line using some curves, it is not the same but should be closer.
The first thing I noticed that is your RawTherapee’s output is much brighter than Lightroom especially in darker areas, which will make the noise look a bit more apparent.
I played with the RAW for a bit in RawTherapee and ended up with this: Is it the best I can achieve “simply” with Rawtherapee ? I made an artificial example, but you really have to zoom to see the differences (real examples with people face are more obvious).Īs a reference, here is the result with the OOC jpeg: I know that there are a lot more options I can play with in Rawtherapee (wavelets for example) but I was amazed by what I can achieve so simply with LightRoom and wanted to know if I could do the same with Rawtherapee. It is especially the case for high iso (3200 ISO) and on people skin/face. However the result is visibly not as good as what I achieve with Lightroom (using the exact same 2 sliders). I followed the Rawpedia documentation by using the Luminance and Luminance Detail sliders: I’m new to RawTherapee and would like to know if I am understanding the noise reduction correctly.
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