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RE: [APML] PixInsight questions ( was:Two New Images)

Gary,
 
From what I gather, division is better than subtracting.  You don't do both.  At least this is how I have interpreted "Flat-Fielding in Film Astrophotography" by Carlos Milovic. 
 
http://pleiades-astrophoto.com/pixinsight/help/tutorials/filmflats-cmilovic/en01.html
 
I could be wrong though since all this stuff is new to me.
 
Wade
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