How to remove imbal...
 
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How to remove imbalance of the brightness by OAG


 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 9 months ago
Posts: 96
Topic starter  

Hello

I corrected the images with Dark, Flat and BIAS.
I was able to handle without problems.

But a imbalance of the brightness by OAG remained at the top left of the image,

so I want to know how to remove it.
It looks like a bit different in each of L, R, G, B.

Thank you

 

Lum 180s
Green 090s
Blue 090s
Red 090s

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4919
 

You can use the LP tool for that (Light Pollution tool). Add 5 boxes around the image, make sure it's background (by stretching the image to the 30% preset) and calculate, check the result and then add 1-2 small boxes towards any gradient that is left and recalculate. Move boxes towards the gradient, not immediately on top of it.


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 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 9 months ago
Posts: 96
Topic starter  

Hello Vincent

Thank you for your answer.
I will use LP tool for the first time, so I will try variously.

This behavior is due to the fact that FLAT is not properly created?
Is it corrected by the appropriate FLAT even if there is an OAG shadow?

Thank you

This post was modified 8 months ago by momo

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4919
 

If the flats work correctly I think it should be able to yes, I have no experience with this and a OAG, but a flat does correct for the overall illumination profile of the optics. Check if you can see if the flats are indeed applied, in the list below when you calibrate the lights will get "MF" added to the filenames.


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 momo
(@mo-mo)
Main Sequence Star Customer
Joined: 9 months ago
Posts: 96
Topic starter  

Hello Vincent

Blue90s lpc
Green90s lpc
Red90s lpc
Lum180s lpc

 

Christian Sasse's video answered a lot of questions. : Https://www.astropixelprocessor.com/complete-lrgb-tutorial-of-ngc292-the-small-magellanic-cloud-by-christian-sasse-itelescope-net-new-version-app-1-081 /

I also used LP tools like videos and LP tools had a wonderful job.

it is really amazing!


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4919
 

It is isn't it. 🙂 This is where advanced algorithms shine.


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