Thanks both.
I wouldn't rely on that halo being at all accurate in colour, Kevin. I had terrible trouble getting the colour balance right. Mixing in the Ha didn't make the process any easier. But I did various incarnations of PI's ColorCalibration process at various points other than the usual one at linear state for the RGB i.e. needed fixing after stretching. Wasn't sure exactly why it was out. But being shot in the 'burbs, there was plenty of background light/gradients to contend with too.
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