Problem: Green colo...
 
Share:
Notifications
Clear all

Mar 28 2026 APP 2.0.0-beta40 will be released in 7 days.

It did take a long time to have the work finished on this and it  will have a major performance boost of 30-50% over 2.0.0-beta39 from calibration to integration. We extensively optimized many critical parts of APP. All has been tested to guarantee correct optimizations. Drizzle and image resampling is much faster for instance, those modules have been completely rewritten. Much less memory usage. LNC 2.0 will be released which works much better and faster than LNC in it's current state. And more, all will be added to the release notes in the coming weeks...

Update on the 2.0.0 release & the full manual

We are getting close to the 2.0.0 stable release and the full manual. The manual will soon become available on the website and also in PDF format. Both versions will be identical and once released, will start to follow the APP release cycle and thus will stay up-to-date to the latest APP version.

Once 2.0.0 is released, the price for APP will increase. Owner's license holders will not need to pay an upgrade fee to use 2.0.0, neither do Renter's license holders.

 

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

5 Posts
3 Users
2 Reactions
4,578 Views
(@skanker)
Neutron Star
Joined: 8 years ago
Posts: 91
Topic starter  

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 



   
ReplyQuote
(@jan-willem)
Neutron Star
Joined: 9 years ago
Posts: 111
 

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

 



   
ReplyQuote
(@skanker)
Neutron Star
Joined: 8 years ago
Posts: 91
Topic starter  
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 



   
ReplyQuote
(@jan-willem)
Neutron Star
Joined: 9 years ago
Posts: 111
 

Hi Gernot,

 

You're welcome 🙂 !

 

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

 

Clear skies Jan-Willem



   
ReplyQuote
(@kijja)
Black Hole
Joined: 8 years ago
Posts: 149
 

@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

 



   
ReplyQuote
Share: