Some behind-the-scenes manipulation is performed to keep the effect of the UI parameters orthogonal to each other. This essentially means that one applies another power function on the normal log-logistic curve, which will cause the distribution, or in our case, the contrast, to skew towards shadows or highlights. It uses a Generalized Log-Logistic curve applied either on work profile rgb channels or on the rgb average as an rgb ratio.
Please check out my curve testing "app" that I made for this project if you want to get to know the curve itself a bit more: This in itself is enough to get excited about the use of this sigmoid curve in image editing! It is a model that describes the cone response for a light pulse compared to an adapted environment. The Naka-Rushton curve is the same curve but with the name used in human vision research.
I can especially recommend the three in bold. Here are some of the more important posts. The process of developing and testing the module is documented in its pixls thread: It is developed as a drop-in alternative to filmic with the same responsibility of compressing an infinite dynamic range to the finite dynamic range of a display or print. A new display transform module based on the Log-Logistic / Naka-Rushton curve with skew added for more control.
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