[Paulyman (Paul)]

So I gave a talk at our local astronomy group meeting the other night about narrowband palettes. One thing I showed was what happens when you create an SHO image from your narrowband masters versus what happens when you first linear fit your masters then create an SHO image.

I pointed out that the linear fit SHO image has far more complexity in terms of subtle hue transitions versus the typical blue gold duotone images you tend to get out of a straight SHO image with nuked greens.

The evidence I used to back that up was my current data of the Great Nebula in Carina. I showed an unfitted blue gold version and a linear fitted SHO version, which you see below. I pointed out the asymmetry left to right. Travelling right to left the tendrils of gas tend from red through orange to yellow. I have looked at other SHO images on Astrobin and it is present in them, so it isn’t a false gradient in my image.

I see it as an asymmetry between the H and S within the nebula hence the hue changes. I can’t find anything when I search the all powerful Google, does anyone know of any papers on this? It is fascinating to delve into what our images are saying to us.

Cheers,

Paul.