This is coming along quite nicely Mark. As has been said already blending RGB and NB data is quite tricky and no one rule works for every image. Marks method is quite simple and works on some while Gregs method is a little more cumbersome and also works on some images but it can be just getting something that suits you and then just a matter of experimenting time and time again.
Interesting stuff and the end result is often well worth the effort.
Good luck. Nice data does help a lot.
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