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I am beginning to think it could be the Atik RGB utility.
I have tried eliminating everything but lights and have deceased the brightness to 50% in the RGB utility before stacking but keep getting the same, albeit less pronounced, clipping. It is also pretty much the same whether I save as bmp or tiff.
I don't really know much more than I have read on various fourms (i.e. nothing), but I tried duplicating the visible layer, upping the contrast until all nebulosity is gone and then putting a 30 pixel Gaussian blur before adding it to the bottom layer.
It fixes it a little, but the clipping is so pronounced, there is not a lot I can do. Perhaps it is getting lost in the 8 bit per channel conversion (GIMP only handles 8 bits at the moment).
One thought I had was that it may be occuring because I am undersampling a little (~2.7 arc sec per pixel). Could that be it?
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