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PixInsight Quick Tip: Color Masks

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#1 Madratter

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Posted 24 December 2019 - 10:18 AM

I was systematically going through some of my old data while working on my website. I ran across the following image of Messier 93.

 

Messier 93 original.JPG

 

While at one time I would have been happy with that result (and apparently I was), I now look at it and those blue stars look a little too green for my taste. What to do?


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#2 Madratter

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Posted 24 December 2019 - 10:22 AM

One obvious try is to simply run SCNR on it and see what happens.

 

Messier 93 with SCNR try 1.JPG

 

The blue stars now have a much more pleasing color without that green cast. Unfortunately, I don't like what has happened to the yellow stars. They are now much more orange (school bus yellow for some of you). I don't care for it. So I have made part of the image better, but part worse (at least to my eye).



#3 Madratter

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Posted 24 December 2019 - 10:28 AM

Color Mask to the rescue. This is located under SCRIPT->Utilities->ColorMask.

 

In this case I want to protect the yellow so I create a yellow color mask. Here are my settings.

 

ColorMaskSettings.JPG

 

And here is the resultant mask.

 

yellowColorMask.JPG


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#4 Madratter

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Posted 24 December 2019 - 10:30 AM

Now I apply the mask to the image and invert it. I invert it because I'm trying to protect the yellows.

 

ColorMaskAppliedAndInverted.JPG


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#5 Madratter

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Posted 24 December 2019 - 10:36 AM

Here is the final result after I applied SCNR with the mask in place. I then removed the mask.

 

Messier 93 final result.JPG

 

My blue stars no longer have that sickly green tinge while my yellow stars are still yellow instead of orange.

 

Hope this helps someone out!


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#6 elmiko

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Posted 24 December 2019 - 10:36 AM

Excellent tutorial! Thanks for sharing!

Merry Christmas to you and your family!


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#7 Madratter

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Posted 24 December 2019 - 10:37 AM

Excellent tutorial! Thanks for sharing!

Merry Christmas to you and your family!

Merry Christmas to you and yours too!



#8 terry59

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Posted 24 December 2019 - 12:47 PM

Great post Madratter

 

Merry Christmas!


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#9 Madratter

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Posted 24 December 2019 - 01:02 PM

Great post Madratter

 

Merry Christmas!

Thanks Terry! Merry Christmas!



#10 Cfreerksen

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Posted 24 December 2019 - 04:17 PM

I will have to try both. Still so new to this.

Chris
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#11 PhotonHunter1

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Posted 24 December 2019 - 05:31 PM

Super post. Very helpful and succinct! Thanks for sharing Madratter. 


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