A marked improvement Stuart. Well done. HaR blends take some time to get right..(and I still stuggle with them). I usually use the R channel as the bottom layer, then layer over the Ha as lighten mode. Leave both images are unstretched I should add. You can also leave the top Ha layer in normal mode and also change the opacity.
Quote:
Originally Posted by rat156
If I try to blend in the Ha as luminance I always get the same salmon pink as the nebulosity colour. This looks better, but is it more correct?
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Yes, it can do that. One method of addressing this is to blend the Ha luminance at 50%, flatten, boost saturation of the image, mostly red. Then re-layer the Ha again at a higher opacity percentage. By performing the initial HaRGB image, you've got a better chance of matching the chrominance data with the rich/contrasty Ha. There's a few other ways of handling this, but if you come up with something else, please share. Always looking for ways to improve the integration of Ha data.
Also, I recommend you re-layer a basic RGB over the top of this image to bring back the star colours.