PixInsight tutorial : advanced narrowband combinations

Heyo !
I wrote a tutorial on how I combine my narrowband data in PixInsight. You can find it here on my website : https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath/
Any feedback is welcome !
Clear skies

Very cool tutorial, thanks for sharing :-)

I've been doing astrophotography for almost 7 years now and while generally speaking I'm pretty happy with my galaxy work, I still struggle with colour on NB images. I think this will help.

Cheers,
Lee

Lee Borsboom:
generally speaking I'm pretty happy

!!!
Your work is incredible IMHO ;)

I also struggle with nb color, thanks for the tutorial.

Lee Borsboom:
Very cool tutorial, thanks for sharing :-)

Hunter Harling:
I also struggle with nb color, thanks for the tutorial.

Thanks! It means a lot coming from you guys, what an amazing gallery you both have

Very nice website, tutorials, and images! Thanks for sharing!

Hunter Harling:
Your work is incredible IMHO

Thanks very much :-) Your work is pretty awesome too!

Thanks! It means a lot coming from you guys, what an amazing gallery you both have

Most welcome!

For someone without having of a math brain I could kind of follow that. Fascinating insight into working in a non-linear space. Many thanks :-)

Thanks for the awesome processing tutorials! I really enjoy the technical aspects of your articles - they’re easy to follow and provide another dimension of experimenting with processing to get the best image possible from available (sometimes not so great) data. You’re style is similar to tutorials by Jon Rista - it’s that good! Looking forward to seeing more. - Jim

Ben:
For someone without having of a math brain I could kind of follow that. Fascinating insight into working in a non-linear space. Many thanks :-)
James E.:
Thanks for the awesome processing tutorials! I really enjoy the technical aspects of your articles - they’re easy to follow and provide another dimension of experimenting with processing to get the best image possible from available (sometimes not so great) data.

Thank you for the kind words and the positive feedback!

James E.:
You’re style is similar to tutorials by Jon Rista - it’s that good!

That's the best compliment I could ever hope for!

Thanks a lot for the tutorial! I will try next time!

Thank you for your great tutorial! - A question for my understanding: if I multiply Ha with (1-OIII) I emphasize Ha everywhere, but not in the OIII region?

Frank:
Thank you for your great tutorial!

Min Xie:
Thanks a lot for the tutorial! I will try next time!

Thanks for the positive feedback!

Frank:
A question for my understanding: if I multiply Ha with (1-OIII) I emphasize Ha everywhere, but not in the OIII region?

That's the idea. Technically you're de-emphasizing Ha everywhere (because you're multiplying each pixel with a value less than 1). If the OIII background is close to 0.2, you'll be multiplying every pixels by 0.8 or less. The pixels where OIII is strong (let's say a value of 0.7) will be particularly de-emphasized (multiplied by 0.3).
You can decide how de-emphasized you want Ha to be depending on the region by applying a contrast curve on (a copy of) OIII.
Since you're de-emphasizing Ha everywhere, it is important to add xxx*OIII so that the channel isn't weaker than the other channels (the sum of the factors shouldn't be less/greater than 1)

Excellent everything!

Very interesting process. I need to give this a try. Thanks for posting this.

Hi my friend this is good to share thinks!!

I am happy and i will try it!!

Thanks again

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