Photography
c/photography is a community centered on the practice of amateur and professional photography. You can come here to discuss the gear, the technique and the culture related to the art of photography. You can also share your work, appreciate the others' and constructively critique each others work.
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My experience is in Lightroom, not Darktable, but LUTs just take an RGB value at each pixel and map it to a different RGB value. The LUT (look up table) is just a big table containing these mappings. They are most commonly used near the end of the development pipeline to do color grading. It's a common way to do something like emulate the color response of a specific type of film, even if you shot digitally.
So, typically I would do my developing (lens profile, crop, exposure, etc.) first, then apply a LUT. After the LUT, then I would tweak the color sliders if there are any I still want to adjust. The color is usually the last step of the process for me.
All that being said, these days I don't really use LUTs any longer. I am mostly doing product photography using a flash in a controlled studio environment. So, I pretty much have some develop presets all dialed in.