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Open your colour image.
Create a new layer - call it Ha red
Copy and paste your Ha into that layer.
Change the blending mode to Lighten
Delete the Green and blue channels (click on channels, shift and click green then shift click blue, control A, delete). Click on rgb again and it should now show that layer as red.
Do the same for Ha as Blue but delete red and green channels. Set to lighten mode. Opacity to suit but usually between 10 and 20%, you are adding the slight blue from H Beta which is included in your Ha data.
You can use curves to accentuate or reduce the layer. Lighten mode only allows through those pixels which are lighter than the orginal image. So boosting or reducing curves makes it appear or disappear. Best method I have found.
Do the same for O111 but O111 is usually assigned to blue and green channels as above.
There is also bicolour which is combining Ha and O111 as red and blue and then creating a green channel of (Ha + O111)/2
I am not 100% on that formula that may be 2*(Ha + O111)/2.
Greg
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