Thanks Irwin- that fixed it- I think my mistake was doing a complete wipe because I liked the fact it stabilised my RGB levels because I am over that blue cast I am getting with the CLS filter (despite using a custom white balance on the camera).
This time I made a single pixel mask and then grew it a few times then used that as a wipe basis- did clip it to black though so maybe a tad dark. When I increased the headroom M43 didn't stand out as much, not that many photons in this set though as was grabbing what I could through the murk.
Thanks for the tip as always!
Graham
