Quote:
Originally Posted by alpal
...we can't see Ha anyway.
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Ha will appear a dark red to the human eye (if intense enough to trigger the eye's L cones). Our eye isn't very sensitive to it but we can see it. It's frequency is near the peak transmission of most red filters so it's typically combined with the red channel. Dark red doesn't really display well on monitors either so you can lose the contrast inherent in Ha signal if you don't render it with a bit brighter red tone. Personal taste creeps in here of course.
Quote:
Originally Posted by rally
...PS I think the image is in fact Ha in grey scale and mixed with colour
Its LHa RHa G B - I assume ?
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Yes. L+Ha, R+Ha, G, B+Ha in fact
Quote:
Originally Posted by alpal
I would assume that too.
Did Marcus say if he took raw luminance - no filter?
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Luminance Filter
Quote:
Originally Posted by risingmoon
The picture is so unbelievably beautiful
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Thankyou Sandra!
Always glad when folks enjoy one of my images!