Thanks for the comments Peter,
I'm not sure how to register to align properly because there appears to be a bit of rotation. I have been re-combining the RGB in PS using Carboni actions so they end up in a single layer (background) in different channels. I've worked out how to shift the individual channels relative to the other two but have not worked out how to rotate one channel. Is this possible?
Also does the histogram reveal whether it is too yellow or is this obvious from how the image appears?
Peter
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