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hi neil,
for adding Ha, i would select the red channel from the RGB channel. copy into a new file -> New. Paste and select new layer down the bottom right. then copy the Ha over as a new layer. then blend via luminosity method - adjust opacity (maybe down to ~20%) paste blue, green and new HaR as layers into a new document in that order and adjust blending options to 'screen' for red to green and green to blue - then flatten and you will have a HRGB image.
Hope that works
-note there may be an easier way Im not a GIMP expert but this way will work.
Cheers
Russ
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