Spent quite some time adding some updates to this work in progress module.
- Made sure there is good orthogonality between the contrast and skew parameters.
- Added an RGB ratio preserving mode, or also known as preserve color in darktable.
- Added a preserve hue mode, known as film-like in RawTherapee.
I will write some more about these things and post some good example images soon. Figured I could notify you all in the meantime such that you can try yourself if you want 