Attached is a screenshot of the median values of M57 in Subframe Selector. I live in a heavily light polluted area where it is darkest (if you can call it that) towards the east and up to the meridian, then rapidly gets brighter on the west side as it nears the light dome over Baltimore. You can see that in the graph as it starts around 3100 ADU and ends up at 5000 ADU a few hours later. This is typical of the area, it wasn't due to high clouds rolling in overnight. What is the best tool / technique in PixInsight to handle a set of data like this? I've experimented with Local Normalization, which certainly flattens the values across the entire data set. And I've tried just integrating the stack and letting DBE handle it. I can't say I've noticed an appreciable difference in those two methods.
The true solution is probably to only image up to, or slightly past, the meridian (or move to the desert).
Thanks,
Dave
The true solution is probably to only image up to, or slightly past, the meridian (or move to the desert).
Thanks,
Dave