When I open 'Remove...
 
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2022-08-17: APP 2.0.0-beta3 has been released !

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When I open 'Remove Light Pollution"...


(@andynowlen)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 54
Topic starter  

When I open remove light pollution the screenshot shows what I see - a pure white image.  I don't know how to resolve this.  It is the first time such a result has appeared for me.  

What should I do?

 

EDIT:  I get the same result when opening 'correct vignetting' and 'calibrate background' in addition to 'remove light pollution.'  If I simply open the stacked integration the image looks fine.  If I click 'neutralize-BG' on the right side, the image goes all white.  What settings do I need to change?  Since I have subscribed this is the first time I have seen this behavior.  Same camera and workflow.

Screen Shot 2021 03 25 at 9.39.59 AM

 

This topic was modified 1 year ago by Andy Nowlen

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4934
 

What camera are you using and if it's a regular astro-cam, what is the offset you used?


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(@andynowlen)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 54
Topic starter  

I am using the Asi533mc pro camera.  I also use the AsiAir Pro and am not able to adjust the offset.  

 

Just so you know.

 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4934
 

Ah, so can you check the FITS header to see what the offset is at? Should be somewhere in that window left from the image.


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(@mestutters)
Red Giant Customer
Joined: 5 years ago
Posts: 144
 

Hi,

When I look at the histogram on your screen-shot above, I see what looks like a single column of what would be very cold dark pixels at the very left hand side then a gap of about 80% of the histogram space before seeing all the values piled up at the right hand side.

I would guess that you can make your data more visible by adjusting the B and/or ST filters.

I suggest that something has gone slightly amiss during Calibration that these cold pixels have not been detected and removed.  Maybe you can try adjusting the Cosmetic Correction / Cold Column Kappa values on the Calibration tab to get a better result.   As I recall the Christian Sasse video shows you how to view what effect changing these values has on your subs.

Regards

Mike

 


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4934
 

Well spotted Mike, that might contribute.


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