Should have been clearer with my question.
All 4 images are as originally stacked, no levels or curves or anything.
The main thing which had me puzzled was why the change in the background hue/colour in the converted RAW to TIF Stack ?
Meaning, I converted the Original RAW frames into TIF before stacking in DSS.
Jase, you made me look at the different bits, have to think a while about that
Andrew, you used the converted RAW frames Stack, the one with the different background, to fiddle with. I found that harder to get the right balance in CS2 then the original RAW stack.
So, it is best to stack the original RAW frames, not convert them to TIF and than stack.?
Thanks to both of you