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2022-01-07:  APP 1.083 has been released !!!

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Strange trails or (bad?) pixels  

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(@infoarnaldolopez-nl)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 14
August 4, 2020 09:43  

Hi,

 

I just tried to stack some long exposure (30 to 90 sec.) of comet Neowise and got strange pixel trails in an opposite direction of the startrails. Would this be solved if I had made darks and bias etc.? 

 

Thanks,

Arnaldo

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This topic was modified 1 year ago by Arnaldo Lopez

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4172
August 4, 2020 14:57  

Very likely yes, these can be bad pixels.


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(@infoarnaldolopez-nl)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 14
August 4, 2020 15:10  

@vincent-mod Thanks for your reply... Is there any way to minimize them without darks etc.? 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4172
August 4, 2020 15:12  

You can try to use cosmetic correction in tab 2, switch the options on for hot pixels, I'm not entirely sure if that works without any calibration data (never tried that). Brin the hot pixel kappa down to maybe 2.5 or lower to make it more aggressive.


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(@infoarnaldolopez-nl)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 14
August 4, 2020 15:24  

@vincent-mod Thanks! I’ll just give it a try... And maybe I’ll make some darks too... If they are bad pixels, they might appear at the same place anyway!? 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4172
August 4, 2020 16:19  

Yes that's why darks work. If you make some proper darks a BPM will be made automatically as well, this you can use on all your data taken with the same sensor. It removes bad pixels and never hurts the data, so always use one is my advice.


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(@infoarnaldolopez-nl)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 14
August 4, 2020 16:46  

@vincent-mod from now on... I will 😉 Thanks for the advice!

 


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(@steveibbotson)
White Dwarf Customer
Joined: 5 years ago
Posts: 31
August 4, 2020 16:54  

You could try some retrospective darks.


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4172
August 4, 2020 17:07  

Good suggestion Steve, you can try that indeed and make a bpm with those.


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(@infoarnaldolopez-nl)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 14
August 4, 2020 17:20  
  • @steveibbotson Indeed, I thought about that. I’ll give it a try! 

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