Upscale binned RGB ...
 
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Upscale binned RGB frames  

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(@lazac)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 3
July 14, 2019 14:00  

Dear Mabula,

I'm taking binned RGB images for my LRGB composites. In the whole processing chain at which phase do you advice to upscale the binned RGB frames? At the beginning, or at the end, after tweaking the combined RGB image? Which interpolation algorithm would do the best job on an upscale?

 

Thank yo for your answer.

Joseph

This topic was modified 3 months ago by Vincent Groenewold - Moderator

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(@lazac)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 3
July 19, 2019 17:49  

Dear All,

 

Is there anyone with an answer? I'm quite new to this application and I probably miss something, maybe a feature or just a simple checkbox which gives a simple answer to my question. What you guys do when your RGB frames are binned? What is your workflow?

 

Thanks,

Joesph


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(@mestutters)
Red Giant Customer
Joined: 2 years ago
Posts: 64
July 19, 2019 22:56  

Hi Joseph,

When I have processed binned 2x2 RGB subs with unbinned L subs,  I have just loaded all the frames into APP (with appropriate binned and unbinned calibration frames to match) then processed them all in exactly the same way as if they were all unbinned subs.

When you get to 4) Register APP will I think have selected an unbinned frame as the reference image and will correctly align the binned and unbinned subs.

During Integration I assume APP uses drizzle method to upscale the binned subs to match the dimensions of the unbinned.

I've also successfully processed binned and unbinned RGB subs in the same integration - no problem.

https://www.astrobin.com/394914/M/?nc=user

Hope this helps

Mike

This post was modified 3 months ago 3 times by mestutters

(@lazac)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 3
July 20, 2019 09:20  

Yes, it does, and it makes sense as well. Thank you for your answer.


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(@7imlooigmail-com)
Hydrogen Atom Customer
Joined: 12 months ago
Posts: 1
July 25, 2019 08:40  

following ...

May I ask what drizzle parameters are set at the 6) integrate stage?

Thanks

Tim


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(@mestutters)
Red Giant Customer
Joined: 2 years ago
Posts: 64
July 25, 2019 09:09  

Hi,

Mabula has written an excellent summary about principles and pros/cons of Drizzle on this forum post:

-  What is Drizzle and when can I benefit from it ?  

Unless you are experimenting (its always interesting to try things) or have specific reasons to choose otherwise, stick with the defaults.

Mike

PS Above I said 'During Integration I assume APP uses drizzle method to upscale the binned subs to match the dimensions of the unbinned.'   On reflection, I think I should more correctly have said 'I believe APP uses an interpolation technique (Lanczos 3) to to upscale the binned subs to match the dimensions of the unbinned subs.'

This post was modified 3 months ago 2 times by mestutters

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