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Hi Trevor
I've been using Siril for about 18m now and I'm still a beginner but have found the following approach works for me.
Using the RGB Compositing script, add your RGB channels as normal.
Then click the + to add another colour. This appears as yellow but can be changed. Insert your Ha stack here and then click on the yellow tile which opens a new menu and here you can select the colour wavelength as Ha. The yellow tile now changes to a red colour, typical of Ha.
Next run photometric colour calibration and see how it looks. It might look a little overly red but this can be adjusted later.
You can do the same process for adding Oiii and Sii and again select the correct colour wavelength for each.
Of course prior to all this you must run the conversion script and registration to perfectly align you RGB and Ha stacks so they can then been colour combined.
See how this goes. It works well most of the time for me.
Cheers
Rod W
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