How do I reduce the...
 
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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

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How do I reduce the green in the background without affecting the galaxy?

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(@msamazing)
Neutron Star
Joined: 5 years ago
Posts: 84
Topic starter  

Looking for the steps please.  Here is the JPG of the image.

M31 RedCat 9 14 23 RGB session 1 sr crop St

 



   
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(@maxthebuilder)
Red Giant
Joined: 8 years ago
Posts: 39
 

Your galaxy is pretty green too so you should want to affect it.



   
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(@imnewhere)
Black Hole
Joined: 9 years ago
Posts: 174
 

Make sure you have neutralize background checked and you can either desaturate the green in selective cooler or if you bring it into Photoshop you can use HLVG, pull down the green channel in curves ro levels, or desaturate and darken the green channel in hue saturation.



   
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(@mabula-admin)
Universe Admin
Joined: 9 years ago
Posts: 5056
 

Posted by: @msamazing

Looking for the steps please.  Here is the JPG of the image.

M31 RedCat 9 14 23 RGB session 1 sr crop St

 

Hi @msamazing,

Best is to make sure first that the image ia background calibrated, is it? The background neutralization is not what you want to use, this only serves as initial preview to get more or less gray backgrounds in your preview RGB images.

Once you have calibrated the background with the calirbate background tool (or remove light pollution tool) then load it into the HSL selective Color tool, select green push it to magenta (that neutralize it) and you can also desaturate the green color at the same time, so set saturation to negative as far as needed. That should remove it.

If you only wan to remove it in the background, use the range options like background to background + 3*noise, that should prevent the operation to affect the galaxy.

Mabula

 


This post was modified 3 years ago by Mabula-Admin

   
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