Accessing parameters of TemporalDegrain2 in Hybrid

[ThoM]

Thanks again,

Where would I "enable Retinex" for my test purposes?

a. the source needs to be cropped of black bars before applying Retinex
b. when Retinex is used as a 'highlighter', best move it to the end of the filter queue

These details are helpful, but I had the more basic problem that I could not find the Retinex function (somewhat hidden in Vapoursynth > Color > Misc) ...

Now I am almost ready to start my tests; but here is another quite practical problem:

Also (assuming Vapoursynth is used) if you want only denoise the dark parts use a limitmask limitting the filtering to i.e. only luma values < 30. 

How can I define such a mask for a filter to affect only a certain Luma range?

Thanks!