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Thanks guys.
Rick - I'd be interested to see your CIE a and b solution. I'm not as familiar with that colour space.
The reason I like this solution is that there's no star masking needed, so you can't get dark halos. It just detects magenta (defined by a red to blue ratio of 0.9 say) as well as the mean of red and blue being greater than the green. There could be some colour shifts in nebulosity as well as stars in rare instances where this rule is matched, but with SHO palette the green would be close to the mean of red/blue so increasing the green a little is not that noticeable in the test images I tried.
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