What are those blac...
 
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What are those black pixels?


(@tempusfugitxxii)
White Dwarf Customer
Joined: 4 years ago
Posts: 24
Topic starter  

What are those black pixels in my stacked image?   I don't remember seeing those before.

Thanks

Jelly fish Ha black pixels

 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4690
 

Could these be caused, perhaps, by a dark that doesn't represent your data? How old are your calibration files? What settings did you use in APP itself on what kind of data?


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(@tempusfugitxxii)
White Dwarf Customer
Joined: 4 years ago
Posts: 24
Topic starter  

I thought of that but I didn't have that problem last week 🤔 


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1636
 
Posted by: @tempusfugitxxii

I thought of that but I didn't have that problem last week 🤔 

Can you please answer Vincent's questions? Without your answers to them, we cannot help you resolve your issue.

 


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(@tempusfugitxxii)
White Dwarf Customer
Joined: 4 years ago
Posts: 24
Topic starter  

@wvreeven Darks are fine. As stipulated in my previous reply, I used the dark library last week without any issues. I did the exact same process on another target and no issue.

I extract Ha from a color image obtained from a OSC.  2.8 hrs total. Fresh flats and darkflats every time. 

Maybe using LNC would hide those?

 


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1636
 
Posted by: @tempusfugitxxii

I extract Ha from a color image obtained from a OSC.  2.8 hrs total. Fresh flats and darkflats every time. 

Is that what you did last week as well when it worked? Was that with Ha extracted from a color image obtained with an OSC as well? If not, what kind of data did you use last week? How long did you expose for each image from which you extracted the Ha signal? What Ha filter were you using? What OSC camera do you use?

Posted by: @tempusfugitxxii

Maybe using LNC would hide those?

You can try to see if it works but if I were you I would want to know the cause and prevent that in the future.


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