DBE background contours

alcol

Well-known member
Jul 9, 2015
78
0
I have been using Pixinsight for a while now but I'm no expert. Recently looked at some published results of background images from the DBE process. The extracted background gradients show smooth images. I have never managed to get these smooth background images and don't know why. I have tried a number of recommended DBE parameters but my background images show contours across the image, see attached. Any advice appreciatedtypical background DBE.JPG
 

nico1038

Member
Dec 28, 2019
24
6
If I understand you correctly I believe that the contours you're seeing don't mean anything, it's just a matter of visualization.
I think that if you click on this icon 24.jpg to use 24-bits for the STF your background will be smooth.
 
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alcol

Well-known member
Jul 9, 2015
78
0
Wow, thanks nico, I didn't know that even existed let alone changed this image looks smooth now and shows where to adjust settings to show the gradient more evenly across the image. can you explain in simple terms what hitting the 24 bit button does to the image? Thanks again. smoothed background DBE.JPG
 

nico1038

Member
Dec 28, 2019
24
6
Sorry @alcol , although I was confident this was the problem I don't understand the subject enough to give you a solid explanation. I'll wait with you for someone with more knowledge ;).
 

pfile

PTeam Member
Nov 23, 2009
7,088
314
its hard to explain this succinctly, but google "posterization" in 8-bit images. the 24bit lut helps images that have a lot of subtle variations in brightness map to the screen without posterization.