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That's a nice image, Jerome. I've never had to match RGB stars to the Luminance. It's not normally that critical unless you have one colour with a FWHM significantly worse that the others and you get coloured rings around the stars.
In the small example you posted it doesn't look like an issue with the stars to me - the black point looks to be quite different. The image on the right is darker and also more detailed.
Cheers,
Rick.
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