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adding RGB stars is easy.
In your stacking software, align the NB Ha stacked images with the RGB final and save all. RGB, Ha, OIII and SII
In photoshop, use star exterminator to remove the stars in each of the 3 NB finals Ha,sii and OIII.
load the RGB image, copy and paste this into the NB image, creating a new layer in it.
Duplicate the RGB layer.
Deselect all layers except these 2 RGB layers.
On one of these RGB layers use starexterminator to delete stars.
select "difference" on one of these RGB layers, you will then see only RGB stars on the screen.
Then "merge visible" in the PS layer menu.
You will then have separate layers of RGB stars and the other starless NB layers.
Set all the layers to "screen" and you will see all the NB layers and RGB stars on the screen as a blended pic.
process each to taste and at the end "flatten image".
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