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Something's not quite right here. Your Ha is showing the loops very clearly (they are very faint) yet the main body shows no Ha.
Here is one approach to blending Ha:
1. Do your RGB image.
2. Add your luminance.
3. Create a new layer call it Ha. Make sure it is RGB mode and not grayscale so click on rgb under image/mode/rgb color.
4. Copy and paste the final Ha image you put together already (Ctrl C CtrlV).
5. Click on channels and delete the green and blue channels. Click on green, hold down shift and click blue, then ctrl A and then click on delete. Then click on on rgb again in channels. Now it should be showing that layer as red. Change blending mode from Normal to lighten. Now only brighter pixels will show through and this will protect your stars from attack from the Ha image.
Now if you use curves you can boost the red effect of the Ha only and not the stars.
6. Do the same for Ha as blue channel. Normally though I find only about 10% opacity for that colour is enough. It takes a bit of the overredness off and shows Hbeta emissions.
7. You can create a new layer and copy the Ha there and set it to Luminosity blend. Adjust the slider for opacity to suit. Depends on the image, too much bleaches all the colour out and makes salmon pinks for Ha areas. Perhaps you can use this and perhaps you can't.
Often you can't. It seems to depend on the image.
If you do use it put the luminance layer below the Ha as red layer not above it. The sequence of the layers has an effect on the image as well.
Other approaches are to add Ha to luminance to make a Ha+luminance layer. You need to balance the levels of each and strike the right balance so one is not overwhelming the other.
Greg.
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