I really like the dev version of generalized hyperbolic transform

Software Siril
1

Still getting used to the new interface; I miss the black point control, but having the histogram and the curve shape does make it pretty easy to understand how I’m remapping my data.

helix
helix1920×1920 692 KB

ASI533, L-eXtreme, f/4.2 refractor (SV503 + SV193), Stellarmate, Siril-eb6b946-x86_64.AppImage

2

You have black point control by switching to linear stretch with the combo box.
So make your changes with the GHT, apply it and switch to linear.

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