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Mosaic normalization issue

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(@rkmvca)
Main Sequence Star
Joined: 6 years ago
Posts: 23
Topic starter  

Hello,

I am having trouble with a OSC 3-panel integration of the Heart nebula. Process flow to date:

- Integrated each panel separately ... they look good
- Loaded the 3 panels as lights
- Performed Mosaic registration
- Performed Normalization
- Integrated the 3 panels

The result is as shown: a very noticeable difference in backgrounds between the 3 panels (shot across 2 nights).

Is there a way to fix this? Should I try to register, normalize and integrate all of the lights together?

Thanks!

- Rich

 

Screenshot 2023 10 22 094414


   
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(@rkmvca)
Main Sequence Star
Joined: 6 years ago
Posts: 23
Topic starter  

OK, I may have fixed it.  I did the above process again, but with the following changes:

- on Integration, changed Multi band blending to 15%, and set LNC from OFF to 6th degree, 3 iterations  (I had LNC off before because I thought the scale of LNC was much smaller than panel size)

Which of these was the magic bullet, or both ?  I think it is vastly improved but not quite perfect, are there other settings which could improve it?  

Thanks,

 

- Rich

heart m 2

 



   
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(@artaios)
White Dwarf
Joined: 6 years ago
Posts: 14
 

@rkmvca It was all of them. There are some good how-to`s in this Forum in regards to Mosaic. In general the following is recommended:

3: Analyse Stars = 3000 or more

4: scale start/stop = 1/15

5: normalization mode = advanced

6: LNC 4th degree and 3 iterations - increase slowly as needed

6: enable MBB - set it to the percentage of your panel overlap, usually 15-20% works fine

As you figured out, both LNC and MBB have been important for your goal. I would say it is the mix 😉



   
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(@rkmvca)
Main Sequence Star
Joined: 6 years ago
Posts: 23
Topic starter  

Thanks, much appreciated!  If interested, here is what I ended up with after a sort of HOO processing:  (abut 72 minutes of light per panel, 130mm refractor)

heartm 1 GIMP DeNoiseAI severe noise

This post was modified 3 years ago by Rich Klein

   
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(@mabula-admin)
Universe Admin
Joined: 9 years ago
Posts: 5254
 

Posted by: @rkmvca

Thanks, much appreciated!  If interested, here is what I ended up with after a sort of HOO processing:  (abut 72 minutes of light per panel, 130mm refractor)

heartm 1 GIMP DeNoiseAI severe noise

Hi Rich @rkmvca,

Great result !

Indeed, like Patrick @artaios indicates there are 3 settings that control how well the images blend.

1) normalize, advanced mode will work better then regular mode in this case for sure !

2) Multi-Band Blending is the main blend technique, so very critical to smooth difference in illumination between the panels. Setting MBB even to a higher % can result in more improvements in some cases.

3) Local Normalization Correction, is responsible to try to remove different gradients between the mosaic panels, so also adds to the mix to improve things.

Mabula

 



   
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