Put the channels into three layers of an image and use Plugins->Colours->Compose-> RGB
Alex Mayrhofer wrote:

i'm trying to assemble 3 grayscale images (each of them representing a single R, G, B channel of the same picture) into a single colour image. I haven't found a way to copy the grayscale data just into a single channel - it always goes to all three channels.

With respect
Alexander Rabtchevich
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