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Thanks Greg
I am actualy not happy with stars. I used nearest neighbour for registration and it seemed to impact the sharpness a bit and makes them look a little blocky. A single sub seems to have much nicer and rounder stars so I may just blend in a combination of a few subs of stars some time.
Big learning curve with CCD Stack. I followed Adams Blocks videos which I highly reccomend. I love this program now that I am familiar with it after spending several hours playing.
I effectively just treated this like LRGB and broke each of the colors from the OSC file into their own RGB files then created synthetic luminance.
I find it easier to process this way than trying to process a single color image.
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