[David Fitz-Henr]

Originally Posted by multiweb

I find I used to get bright coloured pixels in stars in CCD Stack if I stacked color subs rather than mono per channel. It gets worse when there's not enough pixels per stars. It's the bunyip's fault. Those stars are two damn round and sharp because the light is not spread in too many neibourghing pixels.
Might want to try that. I don't know your current flow but try stacking channels separately first then combine colour as the very last step.

Actually I always align/stack mono per channel, and then produce the combined (usually Mean) channel images (ie. L, R, G & B images), and then align these images prior to combining colour, etc. I've sent you some cropped test images for you to test and see if you get the same result/problem in Registar.

Originally Posted by SkyViking

Fabulours work, I always enjoy these deep galaxy views. Your detail and colouring is impressive, great work as usual.
Looking forward to the next one!

Thanks Rolf; my next one may be a repro of this once I get to the bottom of the registration issue!

Originally Posted by gregbradley

Mate you are becoming one of my favourite imagers! Sweet! That mirror is a gem - so sharp.

A couple of nitpicks that could help you. There are registration errors in the stars. Your LRGB masters are not properly aligned and are noticeable in the corners. You can see the cyan or red etc sticking out of stars instead of being accurately aligned on top of each other. I use the plug in CCDIS for CCDstack and that stopped any registration issues I was having. The bright blue star middle bottom has an odd cyan colour which is unnatural and is a processing artifact. That colour could be corrected.

The galaxy itself shows fabulous detail and has been nicely sharpened but your sharpening has been allowed to affect the star in that area as well and they are damaged and look oversharpened. When selective sharpening you can click on white or black background tool White reveals and black hides in layer masks. So you select the dropper tool, set it to a small radius and click black on the stars that got oversharpened when you are doing your sharpening mask and before you flatten the layers. This means the stars are unaffected by the sharpening layer and leaves them looking natural. A few little things like that could elevate the image to the next level.

Greg.

Thanks Greg. Yes, I've found that the red channel was misaligned slightly for some reason - must have had a hiccup in Registar as I tried Registar again and the result was much better. I also found another minor issue as described above with Bicubic interpolation in Registar creating dark pixels around stars which I am trying to get to the bottom of.
Actually I do protect the stars from sharpening & other filters using layer masks; possibly the misalignment of the red has given this impression of sharpening.