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Workflows for STC Astro DUO Filter  

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(@daniel-tackley)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 3
January 9, 2019 22:16  

I have a STC Astro DUO Narrowband filter and was wondering whether anyone had any suggested workflows for processing data obtained using this filter and a OSC camera.

There are at least 2 ways I can see that this data might be processed:

  1. Use the Ha-OIII color debayer algorithm and treat the data as a standard RGB dataset
  2. Use the Ha-OIII mono, Ha-OIII extract Ha and Ha-OIII extract OIII algorithms to separate out mono (luminance?), Ha and OIII datasets for processing as bicolor or HOO

Method 1 above is pretty straightforward and this is how I have processed data so far.

What I am much less clear about is how I would use method 2 to generate separate but registered integrated mono, Ha and OIII files that could be combined using the combine tool or using other software? Any suggestions would be most welcome. At the moment, I can only think of selecting one of the debayer algorithms (e.g. mono) and running through all of the processes. After integration and the resulting file is saved, restart the whole process using the next debayer algorithm and repeat until all 3 files are saved. These may then need to be read back in for a final registration to make sure all are aligned. Is there an easier way? 

This topic was modified 3 weeks ago 2 times by Mabula Haverkamp - Admin

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(@dav78)
White Dwarf Customer
Joined: 5 months ago
Posts: 23
January 28, 2019 22:23  

Hi Daniel,

I use the way 1, as you do.

I've tried once Ha-OIII extract Ha, and the extract OIII, but it didn't work.

So, I'm also interested to know how to process properly the different channels  😉 


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2056
January 28, 2019 23:16  

Hi @daniel-tackley & @dav78,

Method 2) is preferred because you will be able to get much more and different colors in the bi-color composite.

It is quite stratightforward to accomplish what you want to do:

1) you will need the mono (for lum if you need/want is as well) and the extract algorithms

2) start with the Ha-OIII extract Ha (usually more signal so easier registration), process the data up until the Ha integration.

3) don't completely restart now

4) set the other debayer algortihm, for instance the Ha-OIII extract OIII,

5) now go to 5) normalize to normalize the OIII data. (no need to perform registration again, and this ensures the Ha and OIII integrations will be registered to each other)

6) Integrate the OIII data ,

The resulting integrations will be registered to each other thus are ready to load into the RGB Combine tool 😉

Let me know if this is clear and if you can follow this flow 😉

Kind regards,

Mabula

 

 

Main developer of Astro Pixel Processor and owner of Aries Productions


Dav78 liked
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(@dav78)
White Dwarf Customer
Joined: 5 months ago
Posts: 23
January 30, 2019 23:31  

Thank you Mabula for the answer.

I've tried this method and the result seems to be there (just need now to combine properly the two resulting pictures).

The integrate mode have to be set at no drizzle, the bayer drizzle won't work, right ?


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(@kijja)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 40
January 31, 2019 03:41  
Posted by: Mabula Haverkamp - Admin

Hi @daniel-tackley & @dav78,

Method 2) is preferred because you will be able to get much more and different colors in the bi-color composite.

It is quite stratightforward to accomplish what you want to do:

1) you will need the mono (for lum if you need/want is as well) and the extract algorithms

2) start with the Ha-OIII extract Ha (usually more signal so easier registration), process the data up until the Ha integration.

3) don't completely restart now

4) set the other debayer algortihm, for instance the Ha-OIII extract OIII,

5) now go to 5) normalize to normalize the OIII data. (no need to perform registration again, and this ensures the Ha and OIII integrations will be registered to each other)

6) Integrate the OIII data ,

The resulting integrations will be registered to each other thus are ready to load into the RGB Combine tool 😉

Let me know if this is clear and if you can follow this flow 😉

Kind regards,

Mabula

 

 

Hi,

My workflow for most of STC duo narrowband images exactly as Mabula's reply, However, I've founded that even the default AAD algorithm also works well in many situations. It also has an advantage that we can use bayer drizzle integration with the image. Here is my result on Thor's helmet.

thors23400

Cheers,

Kijja

This post was modified 2 months ago by Kijja

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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2056
February 5, 2019 16:31  
Posted by: Dav78

Thank you Mabula for the answer.

I've tried this method and the result seems to be there (just need now to combine properly the two resulting pictures).

The integrate mode have to be set at no drizzle, the bayer drizzle won't work, right ?

Hi @dav78,

I think it will, have you tried ?

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


ReplyQuote
(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2056
February 5, 2019 16:35  
Posted by: Kijja
Posted by: Mabula Haverkamp - Admin

Hi @daniel-tackley & @dav78,

Method 2) is preferred because you will be able to get much more and different colors in the bi-color composite.

It is quite stratightforward to accomplish what you want to do:

1) you will need the mono (for lum if you need/want is as well) and the extract algorithms

2) start with the Ha-OIII extract Ha (usually more signal so easier registration), process the data up until the Ha integration.

3) don't completely restart now

4) set the other debayer algortihm, for instance the Ha-OIII extract OIII,

5) now go to 5) normalize to normalize the OIII data. (no need to perform registration again, and this ensures the Ha and OIII integrations will be registered to each other)

6) Integrate the OIII data ,

The resulting integrations will be registered to each other thus are ready to load into the RGB Combine tool 😉

Let me know if this is clear and if you can follow this flow 😉

Kind regards,

Mabula

 

 

Hi,

My workflow for most of STC duo narrowband images exactly as Mabula's reply, However, I've founded that even the default AAD algorithm also works well in many situations. It also has an advantage that we can use bayer drizzle integration with the image. Here is my result on Thor's helmet.

thors23400

Cheers,

Kijja

Hi @kijja,

If you use AAD deabayering and set the integration mode to Bayer Drizzle, no debayering is done to create the integration (the data is debayered while performing star analysis and normalization, not for the actual integration) 😉 which is preferred !

If you set the mode to Drizzle, then debayering is done, and the debayered data is then drizzled, which is not ideal.

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@daniel-tackley)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 3
February 20, 2019 22:42  

All seems to be working well using the method detailed by Mabula above. Just need to work out now whether there is any benefit from generating a mono image to use as a luminance layer or if just the Ha and OIII images have enough info. Also need to work out the best way to combine the individual images. Here are a couple of examples created using StarTools to process the APP integrations.

Heart Nebula Bicolor v4
Rosette Nebula Bicolour


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2056
February 22, 2019 12:54  

Excellent @daniel-tackley,

Thanks for sharing 😉

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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