Mosaic problem - di...
 
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Mosaic problem - distorted stars in one corner  

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(@einari)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
September 15, 2019 12:46  

Hello,

Just got APP and have now tried to do 2x2 mosaic of Sadr area.
I have now got better results than first tries but still have one corner which have bad stars.

Have made the following changes:
3) Analyze
-> 5000
4) Register
- pattern - quadrilaterals
- use dynamic distortion correction
6) integrate
- LNC - 1st degree - 3 LNC iterations
- enable MBB - 10%
Outlier rejection
filter - MAD sigma clip - kappa 3 - 1 iterations

Registration mode is normal.

 

Some other questions:

1. Can you load all channels (say LRGB or HaOIIIS2) and register them and make mosaic all of them in one go ?
2. Can you save the settings ?

sadr 2x2 app problem LR

 

This topic was modified 1 month ago by einari
This topic was modified 1 month ago by Vincent Groenewold - Moderator

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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 851
September 15, 2019 12:51  

Registration mode should be set to advanced, does that make a difference?

1. Not completely,  usually people tend to run into memory issues, besides that you would need to separately tweak the narrow-band images before combining them with RGB and then assign the narrow band data to R,G or B.
2. Not yet, Mabula is working on precisely that.


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(@einari)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
September 15, 2019 20:33  

After numerous experiments I think I found a way to produce a whole mosaic.

I think this made a difference:
6) integrate
weights - star shape
integrate - median

Now I still have
4) Register
- pattern - triangles
Could try with the 'normal' setting


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(@einari)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
September 18, 2019 18:56  

Still not happy with one corner and would be happy if someone could help me fix this.
Frankly, I made some previous mosaic attempts with more crude methods (even using Microsoft ICE) and got better stars.

sadr 2x2 2019 09 12 96x5m Ha 95x5m OIII mosaic stretch Ha crop

 

Have checked original files and they look ok to me.


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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 851
September 18, 2019 20:43  

Have you used the advanced option already when making the mosaic?


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(@einari)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
September 19, 2019 05:59  

Yes, I tried that.


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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 851
September 21, 2019 16:17  

Mmm, if you want you can upload some of the frames to our server so I can have a better look?

APP server,with login/password: appuser

Please create a folder with your name on it first, thank you.


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(@einari)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
September 22, 2019 10:38  

I already uploaded one nights frames to my Google drive:
https://drive.google.com/drive/folders/1FU5c2CL559SJ6gtmXfLdrxSJaCyMDI0X?usp=sharing

One person tried them and was able to produce perfect mosaic but only if he first stacked individual panels first and then made a mosaic of them.

If that works then why not in one go ?


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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 851
September 22, 2019 11:04  

I have no idea. 🙂 I will download a few and have a look.


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