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I often wondered why I would get some mild green gradients in my deep sky images at my dark site which has virtually no light pollution and certainly not any in the imaging zone.
Then when I started doing nightscapes I started seeing greenish tinges or even bright green sky's in some images. It's called air glow. It's either green (most common) or red depending on which chemical is reacting. Red is sodium.
Also light pollution is usually strongest in the green channel.
This would be a factor of seeing green in images.
I have not seen any green in regular LRGB images over countless images now.
If you see it in narrowband that may be because Ha images are usually displayed in the green channel.
A possible explanation.
Greg.
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