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How do you process an Ha Image? Here is my NGC7000 example, is it right?  

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(@mcbbcn)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 42
June 23, 2019 01:26  

Hi,

Here is an integrated image of 3 x 20min. (Ha) frames and 3 x 25min. (Ha frames), so a total of 6 frames. I used the Ha Algorithm from Tab 0 and it has darks, bias, bpm and flats applied to it. I can't see any nebulosity. I just see a black bakcground with stars, so no contrast. It was taken from Portland Downtown with a QHY9M and narrowband filter.

https://www.dropbox.com/sh/0zwp2cb252sbyj0/AABidnU2-plcidpb_C2LSnB2a?dl=0

If you have tips for processing single Ha frames, please let me know. My goal is to have a good Ha integrated image, and then integrate my Ha image to a OSC image of the same object, and if you have tips for doing Ha + Color, please let me know too.

Please, let me know what you think and/or if you can see any nebulosity.

Best,

Miquel

This topic was modified 3 months ago by mcbbcn

WO 80mm & Maksutov 150mm
QHY8L & QHY9M


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(@jbrazio)
White Dwarf Customer
Joined: 1 year ago
Posts: 12
June 23, 2019 19:22  

Something is wrong with your data file, stretching has no effect on it.

Do you care to post the 6 original fits frames ?


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(@mcbbcn)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 42
June 23, 2019 20:05  

Hi Joao,

I just put everything and one correction, it's 5 sub-frames. 3 subs at 20min and 2 frames at 25min. The above folder should contain now, all the frames, master flat, master dark, master bias and BPM.

https://www.dropbox.com/sh/0zwp2cb252sbyj0/AABidnU2-plcidpb_C2LSnB2a?dl=0

Also, here are some screenshots on how I have SGP configured for my QHY9M. I don't know if an SGP setting could be affecting offset or gain and hence, clipping my black point to the point that it can't be stretched.

https://photos.app.goo.gl/GSzBwDVTWSvKf9N98

I look forward to hear you feedback.

Best,

Miquel

 

 

This post was modified 3 months ago by mcbbcn

WO 80mm & Maksutov 150mm
QHY8L & QHY9M


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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 731
June 27, 2019 20:21  

Sorry for the delay, I'll have a look as well, stay tuned. 🙂

edit: upon reading your process, you don't want to select the Ha algorithm in the 0-tab as this is meant for one-shot colour camera's.

This post was modified 3 months ago by Vincent Groenewold - Moderator

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(@mcbbcn)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 42
June 27, 2019 22:43  

Hi Vincent,

No worries. After checking in a couple of other forums. I learned that my offset and gain settings are very likekly the reason for my black point to be clipped. I will re-take these images when I have clear skies with the new settings and hopefully, all good.

Thanks for jumping in to help.  Best, Miquel

WO 80mm & Maksutov 150mm
QHY8L & QHY9M


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