Get rid of column d...
 
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2022-05-29: APP 2.0.0-beta2 has been released !

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Get rid of column defects


 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 92
Topic starter  

Hello

I started using APP a few days ago. There are many things I don't understand, but the ones I'm currently having trouble with are:

There are column defects in the ccd image. Straight scratches.
Is there a way to get rid of this?

 

 

 
 

 

 

This topic was modified 7 months ago 2 times by momo

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4830
 

Hi Kunihiko,

I'm not seeing the image you posted properly. Did you use the "attach files" link when posting? Could you try again?


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 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 92
Topic starter  
Red 090s

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4830
 

Ah, that looks like a column defect indeed. Your dark frames should show the same, do you have those?


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 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 92
Topic starter  

Yes

One dark and Master Dark  -Attach Files

I useed dark frames, flat frames, bias frames.

Then there are column defects.

Dark 90s
MsterDark 90s
This post was modified 7 months ago by momo

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 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 92
Topic starter  

Hello

I tried some things.
I tried Hot Column Kappa with 7.0 ( 2) Calibrate-Cosmetic Correction).

 

NGC Blue Column kappa(hot)

As a result, Column Defects appears to disappear.

Is this the correct way?
If so, how can I decide the appropriate value of Hot Column Kappa?

And what should I use Cold Column Kappa?


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4830
 

Excellent! Yes, that is a great way if regular darks don't fix it. You can load in a single light and test a few kappa values, then switch to "l-calibrated" view by selecting this on top of the preview-window to see if the line is gone. If not, you change the kappa value slightly and check again. That way you can see the correction directly before doing the entire integration process.

Cold kappa is for cold pixels and these are almost not present in todays sensors. Cold pixels will look like dark spots.


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 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 92
Topic starter  

Hello

Thank you very much.
I understood Hot Column KAPPA.
And I was satisfied with the effects of that.

I hope you have a good weather.


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