Hello, Martin! Lightroom sliders "Highlights", "Shadows" and "Clarity" is not intended to do color transformation. And due to they nature can not much help with CMS and LUT creation. Indeed they are complex image processing operation (Local Laplacian Filter).
You can read more about it from original author (Sylvain Paris): http://blogs.adobe.com/lightroomjournal/2012/02/magic-or-local-laplacian-filters.html http://people.csail.mit.edu/sparis/publi/2015/cacm/Paris_15_Local_Laplacian_Filters.pdf http://people.csail.mit.edu/sparis/publi/2011/siggraph/ https://vimeo.com/118842033 In a nutshell LLF is a robust sharpening algorithm which does not produce ghosting artefacts. N.B. It would be great if The Foundry made a similar filter available in Nuke.
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