Thanks very much for your help Alistair, this is great stuff and I am learning heaps from this exercise. I see there is in fact still a gradient in my image and the one you have corrected looks 10 times better. I will try to find the time to do the tests as you have suggested. Seems a very worthwhile exercise. The one thing I did find with this image, was the noise was so much easier to keep contained than usual, and I didn't touch the saturation at all in the red image, only the orange one, lol. I thought that I was on a winner with 10 minute subs. Oh well we live and learn. Experimentation and great advice from guys like you Alistair is the key to getting better I believe. Thanks again for your help.
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