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Thanks Pat, there's still a lot of room for improvement.
There are no 'normal' RGB lights in the shot.
The colour image is only a combination of the Ha and the OIII data, where the Ha is mapped to the red channel while the OIII is mapped to both the green and blue channels.
There is another method that maps Ha to red and the OIII to green as before, but then a combination of the OIII with a small percentage of Ha is mapped to blue, this is supposed to replicate a H-beta filter.
I tried this method and the colour did look better but I stuffed up my process somehow and the overall image was poor. I haven't had time to go back and start over.
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