[alocky (Andrew lockwood)]

Originally Posted by RickS

I have spent a fair amount of time experimenting with methods for doing this in PixInsight. Similar techniques can probably be used in other image processing packages...

The best way I have found so far is to decompose the NB and RGB images into CIE L*a*b* channels. A star mask is used to protect everything except the stars in the NB a* and b* channels. Blend the RGB a* data into the NB a* and the RGB b* into the NB b*. Then recombine the NB L* with the modified NB a* and b* and voila! This works well because it only changes the colour of the stars and leaves the stellar profile (Lightness channel) unchanged.

Cheers,
Rick.

Thanks Rick - I'm going to try that too!
Cheers,
Andrew