New Sigmoid Scene to Display mapping

I’m aware of your feedback on how to handle colors in the scene to display transform. Adding ratio preserving as a processing option is easy but I have just focused on the shape of the curve so far. Adding skew as well as the other curves to compare with has taken all my time so far.

So I would love some feedback on the curve rather than the color at this point!
Some examples of helpful feedback:

  • How do the black and white pictures look to you? Good? Bad? Why good? Why bad? Etc.
  • Are the images bad examples? Do you have any better test images to evaluate the processing on?
  • Have you tried to tone-curve-explorer? In that case, what are your takeaways?
  • Does the skew log-logistic curve fulfill the mathematical requirements for a scene to display transform? I have added support for display white and display black, custom grey scene+display is also supported but not exposed in the explorer. Skew is still not orthogonal but the effect of it should be clear and I’m working on a solution to the orthogonalization.
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