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Hi Mario!
IMO, when you're processing RGB master, whatever the colour ends up at once you've got the star colours right (some use G2V calibration for this) is the closest you'll probably get. Blending Ha to RGB is where you'll get the black arts coming in. But if you make sure it doesn't depart toooo far from the colours in your RGB you're OK - it's easy to let your Ha overwhelm the brighter parts of the neb. It's usually only the fainter Ha signal I make deep red but some personal preferrence always prevails.
Cheers, Marcus
PS: Even though you're talking about OSC, you should still first calibrate on star colours and use that version as a reference point while you're doing your enhancement processing.
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