Enhancing Galaxies with H-Alpha: Adding Ha Data to RGB Images

***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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