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Thanks Bill. I see what you mean about the stars. I will have to work on that. I'm just getting comfortable with basic processing - though that is usually in Pixinsight. StarTools is an excellent post processing program and I would like to get more familiar with it. Gradient removal is superior in my view.
I installed GIMP 2.8 on my ubuntu box the other day. I notice a subtle change in the way it saves other than native .xcf. It seems that other formats must be exported.
16bit is available in the native xcf format, but it wants to convert tif to 8 bits. fits files seem to get loaded as 16bit xcf. So I guess whatever output you choose for stacking, it has to be fits if you intend processing in GIMP.
16bit across the board would have been nice.
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