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Maybe Beren has the histo-stretch option enabled in the stacking page? I have trouble with registax sometimes over-brightening my stacked image with that option enabled, so I usually try and stack with histo-stretch turned off.
If I have a dark image then I'll turn histo-stretch on so I can see the result, but most of the time I then have to open the brightness/contrast window and drop the brightness to something like -20.
regards, Bird
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