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Old 05-04-2012, 10:03 AM
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allan gould
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allan gould is offline
Join Date: May 2005
Location: Brisbane
Posts: 4,485
Perfect gradient removal

Having tried a few gradient removal programs, however I never felt that they were right on the ball and that includes PixInsight DBE and Gradient Xterminator etc.
While browsing the web I chanced upon this procedure which I can highly recommend for removing complex gradients in mono or colour.

I've attached a recent effort of capturing the Leo triplette with my 5"apo while the moon was right next to the object at about 75% illumination.
After flat and bias removal etc there is still a horrendous gradient from light pollution from the neighbours lights and the moon (second image). Using the above procedure I was able to remove all traces to my satissfaction and recover an acceptable image.
Worth a try in my opinion and I hope this is of value to others.
Attached Thumbnails
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Click for full-size image (Background.jpg)
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Click for full-size image (Autosave-Background.jpg)
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