Combining a H-alpha...
 
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2022-09-02: APP 2.0.0-beta4 has been released !

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windows 2.0.0-beta4

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Combining a H-alpha lights (h alpha filter) and lights (no filter) from H-alpha moded DSLR


(@rjchuri)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 7
Topic starter  

I have a H alpha moded Canon 6D.

I have read several forum topics concerning combining the H alpha (using H alpha filter) lights with the lights using no filter (thus includes all 3 color channels).

I  still do not know the proper workflow for combining the 2 types of lights.

ie. Raw/Fits settings? When are the lights combined etc?

I have successfully used APP for processing the 6D unfiltered lights but have yet to attempt combining with H-alpha.

Thanks

Bob Churi


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1881
 

@rjchuri Hi Bob,

After processing the RGB data you can separately process the Ha data. Once done, you can load the RGB and Ha integration results as lights in tab 1 (don't load any calibration data) and proecess them up to tab 5 Normalization. Then click the save normalized frames button at the bottom of tab 5. The two resulting files you can then load into the Combine RGB tool in the tools tab and assign Ha to H-alpha. You can select the HaRGB 1 or HaRGB 2 formula to combine the frames.

HTH, Wouter


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(@rjchuri)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 7
Topic starter  

Thanks for the reply. Couple questions:

-By process RGB data do you mean integrate it to produce a fits file?

-When processing Ha data what setting in Tab 0 for algorithm? Do you check Multi channel in Tab 1 when Ha processed?

-So the RGB fits and Ha fits are only taken through Normalize, then combined with the Combine RGB tool

-What filter do I choose in the Combine RGB tool for the RGB fits file?

Bob


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1881
 
Posted by: @rjchuri

-By process RGB data do you mean integrate it to produce a fits file?

Yes.

Posted by: @rjchuri

-When processing Ha data what setting in Tab 0 for algorithm? Do you check Multi channel in Tab 1 when Ha processed?

Just use the default settings for both RGB and Ha. One channel will do since there only is one channel. Multi-channel is for when you process different filters at the same time. You can also load all RGB data (incl calibration data) into session 1 and all Ha data into session 2. But processing them separately is easier.

Posted by: @rjchuri

-So the RGB fits and Ha fits are only taken through Normalize, then combined with the Combine RGB tool

No. both get integrated so up to tab 6. Once done you need to align and normalize them. You do that the way I described.

Posted by: @rjchuri

-What filter do I choose in the Combine RGB tool for the RGB fits file?

No filter since you didn't use a filter. If it is a broadband filter like L-Pro then you still don't choose a filter. It is in both cases pure RGB processing.

Wouter


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(@rjchuri)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 7
Topic starter  

No filter since you didn't use a filter. If it is a broadband filter like L-Pro then you still don't choose a filter. It is in both cases pure RGB processing.

Wouter

You stated that no filter be chosen but the Combine RGB Tool has a menu "shot with filters" requiring one to choose something. Am I in the wrong area?

Bob


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1881
 

@rjchuri What version of APP are you using? In both APP 1.083 and APP 2.0.0-beta2 the Combine RGB tool screen has these options:

Screenshot 2022 08 10 at 10.51.01

I don't see the "shot with filter" option that you mentioned. As I stated in my original reply, you need to choose the HaRGB 1 or HaRGB 2 formula:

Screenshot 2022 08 10 at 10.54.00

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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1881
 

@rjchuri Sorry, I now get your question. When you load an image, you get a popup that asks you about the filter(s). So, when you load the RGB image you'll get the popup three times: one for each color channel in the filter. The first channel is R so you choose the Red filter, the second one is G so you choose Green. The third one is B so you choose Blue. When you load the Ha image make sure to choose H-Alpha.


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(@rjchuri)
Molecular Cloud Customer
Joined: 3 months ago
Posts: 7
Topic starter  

Got it!

Thanks for your persistence with me.

Bob


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