strange artefacts in stack  

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 Ronn
(@stardust)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 3
February 5, 2019 20:07  

Hello App forum members, have recently purchased the app and am working on the software. Now with e standard values I have done a test of Barnard 33, the horse head nebula. what strikes me is that strange artefacts occur in the stack. They are not in the separate subs. Somebody has an idea about this? Maybe settings are wrong? hope that you can provide me with clarity,greeting Ronn

stack HA 19 subs met artefacten


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 1956
February 5, 2019 21:57  
Posted by: Stardust

Hello App forum members, have recently purchased the app and am working on the software. Now with e standard values I have done a test of Barnard 33, the horse head nebula. what strikes me is that strange artefacts occur in the stack. They are not in the separate subs. Somebody has an idea about this? Maybe settings are wrong? hope that you can provide me with clarity,greeting Ronn

stack HA 19 subs met artefacten

Hi Stardust @ronn 😉

These are definitely hotpixels and they can easily be removed with a Bad Pixel Map. Have you created one in 2) Calibrate?

If so, try creating one with a slighly lower Hot pixels kappa value. By default the setting is 3, so lower it to 2.0-2.5 and check if the result is better.

 

2 other methods for removing the bad pixels can be found in 6) integrate:

  1. integrate with median if you have less than 20 frames
  2. integrate with average if you have more than 20 frames, but enable a outlier rejection filter like sigma clip, this should take care of the hot pixels.

 

Let me know if this helps or if you need more assistance.

Kind regards,

Mabula

This post was modified 2 weeks ago by Mabula Haverkamp - Admin

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@vincent-mod)
Black Hole Moderator
Joined: 2 years ago
Posts: 264
February 6, 2019 04:33  

Hi Ronn,

Thanks for going here! 🙂 Yes, these are hot pixels and they should be in the seperate subs as well. Maybe have a pixelpeep look at them at 100%. It looks like you dithered the data in 1 direction, if so, that's why you see them moving like this.


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 Ronn
(@stardust)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 3
February 9, 2019 07:51  

thnx Mabula , i give it a try.


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 Ronn
(@stardust)
Molecular Cloud Customer
Joined: 5 months ago
Posts: 3
February 9, 2019 08:43  

thnx for the support Mabula and Vincent.

i think problem solved. 😎 

stack barnard 33 ha lp mod St

This post was modified 1 week ago by Ronn

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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 1956
February 11, 2019 21:49  
Posted by: Ronn

thnx for the support Mabula and Vincent.

i think problem solved. 😎 

stack barnard 33 ha lp mod St

Excellent @stardust 😉 Looks great !

Main developer of Astro Pixel Processor and owner of Aries Productions


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