Do you know if darktable has a lightness control tool?

[pk5dark (Christian Kanzian)]

The Look of this example reminds me on the Old Oak - A Tutorial

@Morgan_Hardwood

Now colors. I discovered a new trick recently - in Lab* Adjustments , bump the CL curve (chromaticity according to luminance ) up, and compensate for this by bumping the CC curve (chromaticity according to chromaticity) down. The effect is difficult to describe - the chromaticity of the image is largely the same (you can control this using the CC curve), but some elements pop more than others in a pleasing way. Pleasing me at least.

You can so the same in dt with two instances of the tone curve with different modes.
Here is an Image where tried to copy that Look