I really like the ability to use a noise estimate for weighting, Roger. It makes mixing mismatched data work quite well. I have even integrated a bunch of narrowband and RGB master frames to make a "superluminance" for a narrowband/RGB hybrid image.
You probably have too much data for it to be convenient, but if you want me to try a noise weighted integration so you can see the result just drop me a PM. [Whoops, just saw Andrew's offer after I hit the button to post my reply...]
Good luck!
Cheers,
Rick.
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