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'Thanks for the info Marc
I used nebulosity 3 for callibration and stacking for this image, first time use. As I am using a DSLR I dont think i can stack as separate channels? Looks like I do need to look at pixel maths though all good learning fun. Happen to have a copy of "the handbook of astronomical image processing" on my lap and I aint reached that chapter yet!
Will chew through your workflow though. On the colour combine I assume the ratio 1:1.22:1.77 is R as 1, G as 1.22 and B as 1.77?
Thanks again.
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