Hi,
thanks guys,
Tonight I tried a combine of the Mar 17 frames and
the Mar 22 frames.
The combination brings back the dark frame artifact but
waters it's effect down a bit.
I also discovered that saving a JPEG with ZERO compression and
keeping a crop just below 200kB, I get rid of a lot of the noise.
Der!...
It's obvious that even saved as a 5% compression JPEG contributes
a lot to the noise. Funny how such an obvious thing right at the end
of a large processing routine can trip me up!
Steve