[Meru (Michael)]

Ah ok makes sense. Hehe thats why I buy Nikon, any excuse to bag canon for me (But might get flogged here given canon's PR with astronomers hehe).

If its white balance then it's pretty easy, if it was LP then its more difficult I find to edit it. I just set the WB manually on my camera before shooining, somewhere around 5000K which works a treat for me. I've never used PI but Photoshop can very, very easily change hues and things so maybe give that a shot? If you shot in RAW then you can batch-correct the balance and then stack again, but some slight post-editing in PS does the treat. Not sure of any other way