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You can do it either way, Graeme. They both really serve the same purpose.
I used to do it in AstraImage using the intensity parameter when doing an RGB combine, but nowadays I simply recombine in RGB with all defaults - I don't change intensity or align RGB. I do all that (aligning channels, adjusting levels) in photoshop afterwards.
By the way i'm sure you know, but a lower intensity (in astra image) will brighten that channel. (eg: 0.8 instead of 1).
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