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[Sticky] RGB Combine tool: a LHaRGB example using H-alpha as both Luminance and Red.

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Universe Admin
Joined: 5 years ago
Posts: 5127

Mm, so when you perform star color correction, you can already look at a stretch and turn saturation on, to see the greenish stars. If you selected stars in area's without nebulosity, the correction should perform pretty well already. Sometimes though, e.g. when filters are used also for the RGB data, you might need to tweak the model a bit.

So you can check the slopes on the graphs, the white line is the standard black body model which is what APP expects the stars to be on (more or less). If you see that the line is not lying nicely in the median (or middle) of the star population in the graph, you can tweak them with the sliders on the left. So for instance to get green less prominent, you can slide the "magenta - green" constant slider a little to the left, towards magenta. The green line in the graph will now show what you changed over the white, standard line. The green line should the be more representative of the star population in the graph.

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