Author Topic: M31 Background Modelization  (Read 738 times)

Offline gcardona

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M31 Background Modelization
« on: 2017 November 26 12:39:53 »
Help! I can't seem to get rid of this simple gradient. I've tried DBE with all sorts of parameters, and the best I could get is a good background, but the galaxy arms still contain a gradient. Help would be appreciated.

https://www.dropbox.com/s/pclap3lkjk1193f/MasterLight.xisf?dl=0


Thanks!


Offline Greg Schwimer

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Re: M31 Background Modelization
« Reply #1 on: 2017 November 26 19:37:44 »
I don't have your result to compare. Try the attached DBE process icon to see how it does for you. There's probably room for some improvement w/ additional samples. Make sure you do not have stars in any of the samples with the tolerance and smoothing factor settings the way I have them.
- Greg
Scottsdale, Arizona, USA

Offline Greg Schwimer

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Re: M31 Background Modelization
« Reply #2 on: 2017 November 26 20:04:29 »
On second thought, try that icon above as-is and also using division as the correction type. Division seems to fix the gradient colors inside the edges of the galaxy better.
- Greg
Scottsdale, Arizona, USA

Offline gcardona

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Re: M31 Background Modelization
« Reply #3 on: 2017 November 27 18:46:23 »
Greg,

Thanks for looking at this. After I posted, I came up with similar parameters, basically using as few samples as possible and putting them evenly throughout the gradient. I think division seems to work out a little better than subtraction in this case.


Gabe Cardona