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Odd Problem with PI and Amp Glow

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#1 Michael Harris

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Posted 25 January 2021 - 12:20 PM

I was working on a short series of M42 lights yesterday which included new flats and dark frames. I calibrated and stacked the flats (with recommended PI settings), and stacked the darks, as per the PI website. I am using a Hyperstar system with the ASI294MC Pro, my lights and darks were 60 seconds and my flats 3 seconds. I did not yet take new flat darks so I let PI scale my regular darks for flat frame calibration. After manual calibration, debayering, registration, and stacking of the lights I found that the amp glow signature of the ASI294MC Pro was still present as black pixels rather than white - apparently I subtracted it twice somewhere along the way, unless someone else knows a better explanation for it. I am going to try again later today and go more carefully through my settings. I have also had problems with WBPP, it has crashed my Mac every time I have used it recently despite all the upgrades and a cleanout of the Mac, so I am doing the steps manually. Any thoughts? Is this due to my lack of flat darks, or a mischecked radio box?



#2 gcardona

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Posted 25 January 2021 - 12:41 PM

You really need to take dark flats to get the correct bias information in the flats. You can't scale the darks on these cameras because of the non-linearity of the amp-glow, hence the need for dark flats.


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#3 bobzeq25

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Posted 25 January 2021 - 12:51 PM

You really need to take dark flats to get the correct bias information in the flats. You can't scale the darks on these cameras because of the non-linearity of the amp-glow, hence the need for dark flats.

+1.

 

I also have had better luck removing the amp glow from my 183s when I do the steps individually, not with BPP or WBPP.




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