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Hi Rodney, Michael and Marcus and thanks for the feedback. Being a comparative newbie to PI, I found it challenging to get decent colour regardless of whether I used normal histogram, generalised hyperbolic or masked stretching. I've tweak my image to reduce the magenta and enhance the blue slightly - it's subtle but does look better. I'll soon have an ASI294MM mono setup running and will re-shoot M83 using LRGB ... it'll be interesting to see what difference it makes to colour and maybe even the CA too. Alex
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