Quote:
Originally Posted by RickS
That could be the reason, Peter. I always find that orange stars oversaturate easily while blue ones need help to show even a little colour.
Using ColorSaturation with a curve that favours the blues is one useful option. ColorMask can also help provided there's a little blue there already. Sometimes I have resorted to PixelMath to make a mask of areas where the blue channel is stronger than the average of the red and green channels. Blurring star chrominance can also help bring some colour into blown out star cores.
Cheers,
Rick.
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Thanks for the feedback Pete.
Rick,
I took a look at the linear RGB without STF and the blue stars are visible. When I apply STF the RGB levels in the centre of the largest blue star go to 0.45/0.43/0.86 so not saturated. It seems one of the steps I'm performing post HT is boosting the Red and Green as the same star in the final image is 0.998/0.998/0.999....maybe the colour balancing?