Dunk,
Thanks.
Re summation stacking - this example was use to "show" me that when summed, the amount of "data" in the image was much, much more than when averaged and hence "could be manipulated more" with higher bit processes..
If you average say a 8 bit file and process as a 16 bit file I can't see the loss of significant info.
Yes, possibly, if you process the 8 bit averaged file in 8 bit process....
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