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Thank you Allan. I indeed used this formula to obtain an "Ha layer" that I added onto my main image using the red channel of my colour image and the red channel of my dual band image (Optolong L-Extreme). Performing quite a bit of noise reduction on the Ha layer also helped in not adding "red noise" into my main colour image. I will continue using this technique on galaxies as I find that being able to see those pink clusters of hydrogen really beautifies galaxies.
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