veil nebula

[hobbit]

A quick attempt at veil.
i notice there's a lot of hot pixels and there were plenty of stacking artifacts as well.

[hobbit]

and a more traditional one

[RickS]

I like the non traditional :)

[raymo]

I like 'em both.
raymo

[BruceG]

Love the first one!
Bruce.

[hobbit]

thanks guys.
any ideas on how to improve the hot pixels and stacking? The subs are supposedly already pre calibrated.

[RickS]

Hard to see the hot pixels and stacking artifacts at that size so just some general thoughts... are you dithering? If not, that should give you a big improvement in quality. Other things to look at are whether your calibration process needs tweaking, whether you have enough subs and experiment with rejection algorithms and parameters to get a cleaner result.

Cheers,
Rick.

[hobbit]

well i'm assuming they're hot pixels. bright coloured dots.
I am dithering.
could probably use more subs, this one was only 110 minutes.

[BruceG]

I'm certainly no expert but a close inspection of these so called hot pixels reveals they are stacking artifacts. You will see a repeating pattern of 2 red dots above 2 closer green dots. Almost as though some stars did not get aligned properly. Strange that it is not global. I agree with Rick, go back to the stacking phase and change some attributes and settings.
You should also try to remove the gradient bright area on the right side of the image if you can. Great colour though.

[hobbit]

I tried using the median stacking mode which seems to have cleared it up a bit. Still need a bit more exposure time to get the noise down though.

[RickS]

Median combine will give you lower SNR than average combine by about 20% so it may be worth persisting with average and tuning the rejection algorithm and parameters.

Cheers,
Rick.

[hobbit]

Hi Rick, Can you advise which settings i should try changing?

[dylan_odonnell]

If all else fails, zoom in and pick them off manually in photoshop. Despite all the best calibration these things happen and it's no big deal to spend 10 minutes and clean up the stragglers :) Really great images!

[Camelopardalis]

Yeah I like both too :D loads of detail, well done :thumbsup: