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Narrow band technique

Processing Narrowband
PixInsight Addicts •7 replies•280 views
Edoardo Luca Radice (Astroedo) avatar
Edoardo Luca Radice (Astroedo) avatar
One of the reasons why I created this group is to share processing techniques.
So here's my first share: it is the talk I held at CEDIC 2019 about an original method to carry out the narrowband merging in pseudo-real colors.

https://www.youtube.com/watch?v=8Xaur_QUOto

From my website you can also download the presentation with PixelMath expressions.

http://www.arciereceleste.it/tutorial-pixinsight/cat-tutorial-eng/110-cedic19-art

Clear skies

Edoardo
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Edward Overstreet avatar
Edward Overstreet avatar
Awesome - Looking forward to watching the video!
Alberto Ibañez avatar
Alberto Ibañez avatar
Very interesting approach Edoardo.
Oleg Zaharciuc avatar
Oleg Zaharciuc avatar
Wow, cool! Thank you!
Geoff avatar
Geoff avatar
Very scientific approach Eduardo. I have occasionally used a quick and dirty version of this method

Ha + SII —> Red
OIII—> Green
OIII + 0.25 Ha —> Blue

See here https://www.astrobin.com/212658/ Probably too pink.
Edoardo Luca Radice (Astroedo) avatar
Edoardo Luca Radice (Astroedo) avatar
Geoff:
Very scientific approach Eduardo. I have occasionally used a quick and dirty version of this methodHa + SII —> Red
OIII—> Green
OIII + 0.25 Ha —> Blue

See here https://www.astrobin.com/212658/ Probably too pink.


This is a very fast but good approach to the bicolor composition: yes, maybe it's a little bit too pink, but you can easily turn it redder lowering the 0.25 "Balmer" factor.

I've seen that on dusty emission nebulae it usually is between 0.12 and 0.18 (due to dust reddening that lower the Hbeta line)
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Victor Van Puyenbroeck avatar
Victor Van Puyenbroeck avatar
Thanks for sharing Edoardo!

I also used the Balmer factor approach for one of my Ha-enhanced RGB images.

The emission nebula in IC59/IC63 is relatively pink in pure RGB, see: https://www.astrobin.com/59wo1l/0/I used pixelmath to add 100% of the H-alpha data to R and 20% to B to simulate the H-beta emission. The hue of the Ha-enhanced image matches the RGB quite well, see: https://www.astrobin.com/59wo1l/E/
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Richard Francis avatar
Richard Francis avatar
This is a very interesting presentation. Thanks for sharing!

cheers,
Richard
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