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Combining OSC with Ha  

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 Gary
(@garyrmck)
White Dwarf Customer
Joined: 2 years ago
Posts: 15
March 5, 2018 10:37  

Hi,

Can someone please outline the steps taken to combine OSC frame with an Ha frame, with the Ha being used as luminance.

Is it possible to do this with images of different resolutions? If so how?

I have tried the Combine RGB tool, but I get a Java out of bounds error.....

cheers

Gary


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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 2 years ago
Posts: 91
March 5, 2018 17:47  

Hi Gary,

 

I've seen you're request and want to share with you my workflow. I do own a asi071 pro OSC camera. (And also a Nikon DSLR).

 

When I process my HA data I always use the HA algorithm for the first tab (0) (this in stat of the ussaly Adaptive Area Disk). Also choose in the first tab the right debater protocol (for my can it is RGGB) and check Force CFA.Than as ussaly load my light frames flats bias and bpm. I will proceed just as a RGB stack only I don't use the Dynamic Distortion Correction any more because when I use that my stars are "shifting" when I combine. I don't know why but I'm I contact with Mabula about this. 

After I create a RGB stack and an HA stack I will clear everything (simple thing would be shut down APP and restart it Again, than al the settings are in the right way), load the RGB and Ha together, just press register. After register just save the files (press save register files on the bottom of the register tab). Tha i should open the combine tool and first load the RGB stack and located them to the channels red green blue. Then press calculate and load the Ha file. As it is right the combine tool now says "custom file" change it into HA file. Now say to the HA channel to blend it with red for also 100% (you end up with 50% red and 50% ha automatically). If you desire you also can add it as a luminance channel but it will give you a "pinkish" nebula. Just in stat of the red channel use the L channel.

Because the HA data is most time much weaker than the red you need to play with the multipliers for example with weak ha data you must set it sometimes as high as 5 or so. For the rest you need to "play"  😉  with al the multipliers to get the the "right" colours. Sometimes when the Ha data is a bit strong you must set the blue and green a bit higher but it is al visually.

Mabey this is helpfully for you? 

 

Kind regards, jan-Willem


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 Gary
(@garyrmck)
White Dwarf Customer
Joined: 2 years ago
Posts: 15
March 5, 2018 20:21  

Thank you so much jan-Willem for your detailed reply. I am using an AI071 Pro for the OSC and a QHY9 with filter wheel for the mono. I will try your process in the next day or so and post my result here.

cheers

Gary


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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 2 years ago
Posts: 91
March 5, 2018 21:22  

Hi Gary,

 

You're welkom i'm looking forward to you're results, good luck  😀  👍 

 

Cheers Jan-Willem


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(@thompeters)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 39
March 8, 2018 14:26  

Jan-Willem,

 

Thanks for posting this too. I have an ASI1600MC (non-cooled) and have considered adding Ha too. I'm glad your actual work flow matches what I'd envisioned for adding Ha to RGB.

It did give me pause when I looked at the FITS files from the camera being grey scale. WAIT thought I'd bought a color camera!?!?!?!?! But I just went ahead and registered and Integrated the data, and low and behold an RGB file!! Wonderful!!

 

Thom 


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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 2 years ago
Posts: 91
March 8, 2018 19:13  

Hi Thom,

 

Nice to hear "my" workflow also works for you  😀  👍.  I think it is one of the easy way to combine a RGB with HA. But there are many ways to accomplish this. Hope to see you're results on the forum. Succes.

 

Cheers Jan-Willem


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(@thompeters)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 39
March 8, 2018 21:09  
Posted by: Jan-Willem

Hi Thom,

 

Nice to hear "my" workflow also works for you  😀  👍.  I think it is one of the easy way to combine a RGB with HA. But there are many ways to accomplish this. Hope to see you're results on the forum. Succes.

 

Cheers Jan-Willem

Will do once the clouds clear again!  🙁

 

Thom


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(@mabula-admin)
Quasar Admin
Joined: 3 years ago
Posts: 2160
March 21, 2018 12:10  

Hi all @garyrmck @jw_duijndamhetnet-nl @thompeters

Apologies for my late response.

A couple of days ago, a similar question was asked by Adam @singding and he provided his Ha, R,G,B channels so you can try for yourself.

https://www.astropixelprocessor.com/community/tutorials-workflows/having-trouble-eith-colors/

I made the post a sticky because I did a full post-processing of his data in APP in this post:

https://www.astropixelprocessor.com/community/tutorials-workflows/having-trouble-eith-colors/#post-2788

I used the H-alph layer to contribute to Red, so HaRGB, but I also used it for 50% as luminance of the compositie, so you could call it a LHaRGB, Ha is used for both Red and L.

Cheers,

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@mabula-admin)
Quasar Admin
Joined: 3 years ago
Posts: 2160
March 21, 2018 12:13  

Hi  @garyrmck @jw_duijndamhetnet-nl @thompeters

I have moved this topic to the Tutorial and Workflow forum 😉

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@foucault)
White Dwarf Customer
Joined: 12 months ago
Posts: 18
November 14, 2018 09:09  

Hi, I have just started using APP.  The result of my first processing job Iooks quite promising to me, but I have doubts my process was the most efficient one. 

I have an ASI 1600 MCC (colour camera). I am shooting one session without a filter and one session with an h-alpha filter.  So my problem should be similar (If not identical) to the one described here.
I want to combine the r, g and b channels from the first session with the red channel from the second session (containing the h-alpha information).
What I did was
processing the first session,
switching to Fitswork to separate the channels into different files;
then process the second session, 
again switching to Fitswork, saving only the Red channel,
going back to APP registering the different colour channels,
Saving them as separate registered files again,
and finally combine the four channels/files using the RGB-tool.
I would be most grateful, if anyone could suggest a more efficient (faster) way of processing these files.
 
Stefan

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(@bengourben)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 3
November 14, 2018 16:19  

Hi Stefan.

You just calibrate and integrate the data that you shot with the h-alpha filter the same way as your RGB, but before you start select 0 RAW/FITS, and in there you can select H-alpha as the finished stack. APP then will produce monochrome h-alpha stack of your data with the blue and green channels removed.

Hope this helps.

Jason


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(@foucault)
White Dwarf Customer
Joined: 12 months ago
Posts: 18
November 15, 2018 11:54  

Hi, Jason:

found it, thank you very much. Do I still have to choose Multi-Channel Processing and Channel Splitting or is that all taken care of by choosing h-alpha?

Stefan

 

 


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(@foucault)
White Dwarf Customer
Joined: 12 months ago
Posts: 18
November 17, 2018 22:45  

Hi,

I now have spent some time trying to combine an RGB-Image and an Ha-Image, both taken with the ASI1600MCC.

Now I am about to give up. Most of the time, results of the different stacking processes didn't match up. Resulting images were of different size and bit depth, I was never sure with debayer-algorithm to use (for darks, flats, bias, lights, for the resulting files), flat files actually seemed to make vignetting worse in the RGB-Image while improving the Ha-Image, and how am I supposed to know, what color to assign to "Channel 1". Or the difference between light and integration frames???

I've returned to DSS for now.   Resulting images are not much worse, but the process is much faster and easier for me. Now I'll sleep over it and maybe give APP another try tomorrow (or the day after...). 

A Manual would really help. Some people. Like me.

Stefan  😩 

 

 

 


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(@bengourben)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 3
November 19, 2018 00:59  

Hi Stefan.

I'll try and post a link to a workflow that really helped me. It can be confusing, but this is very helpful.

https://www.astropixelprocessor.com/community/tutorials-workflows/having-trouble-eith-colors/#post-2853

I hope this helps.

Jason


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(@foucault)
White Dwarf Customer
Joined: 12 months ago
Posts: 18
November 19, 2018 13:07  

Hi, Jason:

That does help, thank you.

I guess, tough, my problems start earlier in the process, i.e.:

when to choose Multi-Channel,

when to split channels,

which debayering Algorithm to apply,

how to do a proper flat (or flats)

what to do with the resulting RGBfile (or files) and the resulting ha-alpha file (or files),

among other things.

Stefan 


 


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(@mabula-admin)
Quasar Admin
Joined: 3 years ago
Posts: 2160
December 4, 2018 10:36  

Hi @foucault, @bengourben & @vincent-mod ,

Please accept my apologies for this delayed response.

I have been away on holiday, but now I am back and I have started work again.

 

You are trying to combine monochrome Ha data with broadband RGB data, right?

The best way to process this is to first

  1. Make the monochrome Ha integration using the Ha debayer algorithm
  2. Make the broadband RGB integration.
  3. Split the RGB integration into 3 channels by loading it as a light frame and then in 2) enable split channels and click on save calibrated frames.
  4. Now register and normalise the R,G,B, Ha channels and save this in 5) Normalise
  5. Load the registered and normalised channels into the RGB combine tool to make a HaRGB composite.

 

Combining monochrome and RGB data will not work in a multi-channel setting. Multi-channel processing requires all data to be monochrome at the moment.

The reason it doesn’t work is that monochrome data (1 channel) can’t be normalized to RGB data (which is 3 channels).

Let me know if this answers your questions and if you have any others.

Kind regards,

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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