I have been playing around with logistic functions in Lattice to create contrast curves in 1D/3D LUT’s.
A logistic function is a common s-shaped curve. When applied to a log encoded image it simulates a contrast curve. The curve can be encoded into 1D or 3D LUT’s for application in video editing software and image processing.
When the above function is applied in Lattice the following result is achieved:
To learn more or play around yourself, find Lattice here: