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Hi Mark,
Many thanks for your thoughtful reply. I follow what you are saying about over-saturation, but I'm confused as to how one works around the problem even if short RGB exposures have given one a good colour star layer. I assume that most images wil have over saturated stars if they are bright and the object of interest is fairly dim just because of the sub frame length needed to catpure the dim oject. I also understand that if the luminance layer has gray, and not white, colour can be added, so, is it a question of removing over saturated stars and replacing them, or is there a method of blending an over saturated luminance layer with RGB data and actually colouring the over saturated stars? If you could point me towards a tutorial that roughly follows your method I would be very grateful!
Thanks,
Peter
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