Uploaded September 2024 | Updated September 2026, 2 weeks ago
****Thanks to @raygorley9797 for pointing out my mistake for the formula used in the Blue channel when compositing the final image. It should be B+Q*(HaCS-med(HaCS))*.2 not R+Q*(HaCS-med(HaCS))*.2. I've corrected it below.****
In this video, we'll dive into the powerful technique of adding H-alpha (Ha) data to RGB images of galaxies using continuum subtraction in Siril. The 2 sets of data in this video were acquired with a OSC camera. One set was imaged with the Optolong L-Pro and will be our RGB data, and the second set was taken with the IDAS NBX II, dual narrowband filter where the Ha data was extracted from.
Pixel Math Formulas:
For the continuum subtraction
Check Use single RGB/K
RGB/K: Ha-Q*(R-med(R))
Parameter: Q=.1 (Adjust)
For the final image
R: R+Q*(HaCS-med(HaCS))
G: G
B: B+Q*(HaCS-med(HaCS))*.2
Parameter: Q=3 (Adjust)
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👽 Dwarf II Smart Telescope Affiliate Links:
🔭 Dwarf Lab: dwarflab.com/?aff=59
🔭Amazon: amzn.to/3SS1Ogq
📚 Siril Tutorials
🗐 youtube.com/playlist?list=PLJeHInlBzFrZTPsonKuuepOEvc1CzsRhF
🏘️ Social Media:
🚪 Facebook ➔ facebook.com/@DeepSpaceAstro
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#DeepSpaceAstro #astrophotography #siril
****Thanks to @raygorley9797 for pointing out my mistake for the formula used in the Blue channel when compositing the final image. It should be B+Q*(HaCS-med(HaCS))*.2 not R+Q*(HaCS-med(HaCS))*.2. I've corrected it below.****
In this video, we'll dive into the powerful technique of adding H-alpha (Ha) data to RGB images of galaxies using continuum subtraction in Siril. The 2 sets of data in this video were acquired with a OSC camera. One set was imaged with the Optolong L-Pro and will be our RGB data, and the second set was taken with the IDAS NBX II, dual narrowband filter where the Ha data was extracted from.
Pixel Math Formulas:
For the continuum subtraction
Check Use single RGB/K
RGB/K: Ha-Q*(R-med(R))
Parameter: Q=.1 (Adjust)
For the final image
R: R+Q*(HaCS-med(HaCS))
G: G
B: B+Q*(HaCS-med(HaCS))*.2
Parameter: Q=3 (Adjust)
Make a channel donation or join one of the membership programs.
👽 YouTube: youtube.com/channel/UCD_yd3ej62tm94IOaYzrAyw/join
☕ Buy me a Coffee: buymeacoffee.com/deepspaceastro
👽 Subscribe to my Channel ➔ youtube.com/@DeepSpaceAstro?sub_confirmation=1
👕 Deep Space Astro Merch: deepspaceastro.myspreadshop.com
I make a small commission at no cost to you when you make a purchase through my affiliate links below. It's a great way to help support the channel!
🔭 ZWO: zwoastro.com/?ref=richstevenson
🔭 High Point Scientific Affiliate Link: highpointscientific.com/?rfsn=7114225.7c470a
🔭 Agena Astro Affiliate Link: agenaastro.com/?rfsn=7382644.0a5a304
🔭 Astro Gear Affiliate Link: astrogear.net/?ref=deepspaceastro
🛒 Amazon Affiliate Link: amzn.to/3YWWnwH
👽 Dwarf II Smart Telescope Affiliate Links:
🔭 Dwarf Lab: dwarflab.com/?aff=59
🔭Amazon: amzn.to/3SS1Ogq
📚 Siril Tutorials
🗐 youtube.com/playlist?list=PLJeHInlBzFrZTPsonKuuepOEvc1CzsRhF
🏘️ Social Media:
🚪 Facebook ➔ facebook.com/@DeepSpaceAstro
🚪 Tiktok ➔ tiktok.com/@deepspaceastro
🚪 Instagram ➔ instagram.com/deepspaceastro_official
#DeepSpaceAstro #astrophotography #siril
