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Hi Martin,
I've tried a similar process before when processing NB images. Using MaximDL colour combine function to determine what "looked" right (as there technically is no wrong). Start with a 4:1:3 ratio for SII:Ha:OIII respectively and turn on background equalisation before making final adjustments. Once they look right, take note of the adjustments (ratios). Then using pixel math to subtract the background on each combined sub, but making sure you leave the pedestal. This ensures the subs are all equalised, then use pixel math again to scale the images based on the ratios previously noted i.e 4.2 would be 420%. Once the individual subs scaled, go back into the colour combine tool and combine with 1:1:1 ratios. I think this is what Russ Croman explained at the 2005 AIC. I've had mixed results using this method and find clipping masks give greater flexibility. This has been in my limited NB processing experience anyway. You could always re-layer the stars to circumvent the NB halo phenomenon. Again and lovely image. Well done.
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