Problem: Green colo...
 
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[Solved] Problem: Green color cast after "calibrate star colors"  

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(@skanker)
Red Giant Customer
Joined: 2 years ago
Posts: 51
November 16, 2019 10:49  

Hello!

I have illustrated my problem in the picture below. After calibrating the star colors, the colors are completely desaturated and the picture gets a greenish tint.

 

colorcast

 

As you can see in the example picture the colors look much better before the calibration. Do you have an idea what went wrong?

Is it possible to skip the "calibrate star color" step?

 

I have loaded the stack into a drive folder for you. You can try it yourself 🙂

https://drive.google.com/drive/folders/1lejQi18FL-0NlBh55dOCepqeS4uF0gM4?usp=sharing

 

Used equipment: Canon 6Da + Optolong L-Pro Clip

 

CS Gernot 


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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 3 years ago
Posts: 96
November 16, 2019 13:02  

Hi Gernot,

 

There is a small shift ( i think du the Optolong filter) to the green side, if you open the star calibration tool you need to move the Magenta / green constant slider to the - this will move the green cast to the magenta side ( from green to white).

See screenshot for the settings i used.

I did make in a few minutes this version of you're data, maybe a bit to the red / magenta side but i did it on a small laptop screen.

 

Hope this helps,

 

Clear skies, Jan-Willem

Settings APP star color calibration
St avg 5476.0s WC 2 2.5 none x 1.0 LZ3 NS full eq add sc BWMV nor AAD RE MBB5 1stLNC it1 cbg csc St

 

This post was modified 8 months ago by Jan-Willem

(@skanker)
Red Giant Customer
Joined: 2 years ago
Posts: 51
November 17, 2019 19:13  
Posted by: @jw_duijndamhetnet-nl

Hi Gernot,

 

There is a small shift ( i think du the Optolong filter) to the green side, if you open the star calibration tool you need to move the Magenta / green constant slider to the - this will move the green cast to the magenta side ( from green to white).

See screenshot for the settings i used.

I did make in a few minutes this version of you're data, maybe a bit to the red / magenta side but i did it on a small laptop screen.

 

Hope this helps,

 

Clear skies, Jan-Willem

Settings APP star color calibration
St avg 5476.0s WC 2 2.5 none x 1.0 LZ3 NS full eq add sc BWMV nor AAD RE MBB5 1stLNC it1 cbg csc St

 

Hello Jan-Willem!

 

Thank you for your help! It worked 🙂

 

CS Gernot 


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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 3 years ago
Posts: 96
November 17, 2019 21:56  

Hi Gernot,

 

You're welcome 🙂 !

 

You've got very nice data hope to see the end result soon.

 

Clear skies Jan-Willem


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(@kijja)
Neutron Star Customer
Joined: 3 years ago
Posts: 117
November 18, 2019 06:44  

@skanker

Hi,

An alternative method is to apply HSL selective color after calibrate star colors. In you case, I try remove cyan from green, reduce cyan in yellow, remove red and yellow from cyan, and increase magenta in red. Just play around with these colors!

Cheers,

Kijja

St avg 5476.0s WC 2 2.5 none x 1.0 LZ3 NS full eq add sc BWMV nor AAD RE MBB5 1stLNC it1 cbg csc SC St

 


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