That is surprisingly good for a northern object imaged in Oz. You got a lot of good data there.
Ha dominates the image because it is the strongest signal hence the green colour as you assigned it green.
You can use pixel math and make the red and blue channels multiplied to boost them or use curves on the red and blue channels only to get a better colour balance.
Ot when you do your colour combine set the weights by trial and error. Probably something like 4 for red and blue and 1 for green. Perhaps even stronger than that.
Greg.
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