Star Color Calibrat...
 
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9 July 2020 - APP 1.082 has been released which contains one important bug fix. 1.082 has full Fujifilm RAF support, so that includes SuperCCD & X-Trans camera's 🙂 !

9 July 2020 - New and updated video tutorial using APP 1.081: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse (iTelescope.net) and Mabula Haverkamp

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Star Color Calibration Issue  

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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 25, 2020 09:39  

I try to process my data from m51.

My files  are R G B and HA from OSC 

Everything going normal before Star Color Calibration after this my data taking a reddish color and i cant get over it ...

 This is Before star Color

Be4 Start Color  Calibration

And this is after

 

After Star Color Calibration

Any Help will be appreciate  it ... 

If someone want i can upload my data to check it ...

Many thanks.

 


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(@astrogee)
Red Giant Customer
Joined: 2 years ago
Posts: 98
May 25, 2020 14:24  

Maybe you have a dark frame problem like me although your results don't look so bad - mine appeared to lose all red content. If things don't go as expected, analyze your darks, flats and bias frames. Do an integration with only the lights and then successively do more integrations while adding one of the calibration frame types each time. Good luck


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 25, 2020 14:32  

@astrogee

Thanks for the reply mate ...

My calibration frames are from my library and are check it ...

I still cant understand why the star color calibration effects on galaxy or in nebulosity ...

Normal must effect only in star color ...

If you want i can upload my files to give a try ...  


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(@astrogee)
Red Giant Customer
Joined: 2 years ago
Posts: 98
May 25, 2020 14:37  

Hi Stratos, My understanding was that the star colour calibration was using stars to calibrate the white balance of the whole image. Your image looks like its not lacking in colour - maybe too much. Do you have a UV/IR cut filter? Without one you will get too much red from the IR spectrum above Ha.


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 25, 2020 14:44  

@astrogee

My R G B data is from L pro filter that have uv-ir cut ...

my Ha data is extract from L enhance  filter so must not be a problem...

 


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(@astrogee)
Red Giant Customer
Joined: 2 years ago
Posts: 98
May 25, 2020 15:29  

Is this your first time with those filters? I think some of them can affect the normal colour so maybe you should not do star colour calibration. Narrow band imaging will not give you true colour - although I think the L-Pro is pretty balanced, but not L-enhance. You kind of have to mix and match the colours to give something nice looking like the Hubble palette. I think you can skip star colour calibration.


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(@astrogee)
Red Giant Customer
Joined: 2 years ago
Posts: 98
May 25, 2020 15:37  

Actually, I think you need to do multichannel/filter processing and then do combine RGB Tool at the end.


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 25, 2020 17:03  

@astrogee

Its not first time that i using these filters ... I shoot almost exclusively with them ... from L enhance I took only ha so can’t unbalance my rgb ...


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33

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(@astrogee)
Red Giant Customer
Joined: 2 years ago
Posts: 98
May 26, 2020 00:11  
Posted by: @hyperion

@astrogee I Use this workflow my friend for this kind of data ...

https://www.astropixelprocessor.com/community/tutorials-workflows/combining-r-g-b-with-ha-oiii-data-using-an-optolong-l-enhance-filter/

That looks awfully complicated. I think APP will do it all with multichannel processing by adding each RGB and Ha-OII - tab 0 has Ha-OIII algorithm, which I think you can add to the RGB with RGB tools at the end. I've done narrow band but not OSC narrow band, which I think has been supported very recently, since that posting.


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 26, 2020 09:29  

@astrogee

We will wait to see what moderators will answer mate ... I’m very interesting too see how will work the star color calibration...or if I must skip it ...


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1913
May 28, 2020 11:14  

It's not too complicated when you follow along. APP can't normalize mono data with broadband RGB, so it's better to do this separately, making it nice and clear as well I think. You can produce all mono data at once and create the integrations. Then the RGB and then you can use that data in Combine RGB to mix in the mono data.


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 28, 2020 11:38  

@vincent-mod

Thanks for reply Vincent !!!

But how can I do it separately ? 
Have any workflow or some instructions ? I use this workflow but seems don’t work good ...

https://www.astropixelprocessor.com/community/tutorials-workflows/combining-r-g-b-with-ha-oiii-data-using-an-optolong-l-enhance-filter/


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1913
May 28, 2020 11:53  

So where does it go wrong for you in that workflow?


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 28, 2020 12:12  

@vincent-mod

In beginning of post have two pictures with before and after star color calibration... 

Do you want to upload my files to check them ?


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1913
May 28, 2020 13:06  

Ah sorry, I didn't look close enough there. So, those frames are the result of RGB Combine right? Combining RGB with the H-Alpha.. did you select only stars or also the galaxy itself? I think only stars would work better.


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 28, 2020 13:11  

@vincent-mod
Yeah my files are RGB and HA combine... everything work great before star color calibration after this all meshed up ... I boxed only stars for calibration not the galaxy ...


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 1913
May 28, 2020 13:13  

Mmm, so you can ofcourse skip the star calibration then as that already looks good. But if you want I can have a better look as well, you can upload that one file to our server if you want, login/password: appuser


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 28, 2020 13:16  

@vincent-mod
Sure !!! I will upload the RGB HA files 

in server to check them...

I will send you here in post the details of 

folder ... thank you so much Vincent...


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(@hyperion)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 33
May 28, 2020 14:53  

@vincent-mod

I uploaded Vincent ...

The folder name is Stratos Sinathis M51

Thank you ...


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