LBN581 in Ha

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Ken_nneth
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LBN581 in Ha

Post by Ken_nneth » Wed Jan 10, 2018 12:38 am

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I am still learning the fundamentals of image processing and now I am trying to get a grip on noise reduction. This image of LBN581 is a stack of 60x120s Ha subs taken with my ASI1600 and Baader filter. There are probably several things wrong with this image, but my concern now is the noise. I have been trying with “MultiscalelinearTransfor” a feel that I understand how it works, what other tools can I use? I would really like some feedback on the noise level and what I can do to reduce it.
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DkN
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Re: LBN581 in Ha

Post by DkN » Wed Jan 10, 2018 8:25 am

Nice stack of Ha. I've never been good with noise reduction as it mostly seems to cause other issues. With that 1600 I wouldn't suspect much noise. Best suggestion is to get as many hours of light you can stand and that will make noise reduction unneeded.
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Re: LBN581 in Ha

Post by Europa » Wed Jan 10, 2018 8:39 pm

With 60 images, I wouldn’t expect much noise and I didn’t see much in your photo, but others here are much more knowledgeable.

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Re: LBN581 in Ha

Post by gardenfish » Thu Jan 11, 2018 4:59 am

I do not see a lot of noise. To me it looks as the focus is just a little soft.
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h2opolo
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Re: LBN581 in Ha

Post by h2opolo » Thu Jan 11, 2018 10:14 am

I'm not seeing noise either but I agree with Rick. You're defiantly soft on focus. Look at your stars you can see it there.
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MikeM
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Re: LBN581 in Ha

Post by MikeM » Thu Jan 11, 2018 10:59 am

The image is a touch soft, but that could possibly a result of the noise reduction. I do see noise, but it's not widespread which is strange. It's up along the left side and top left corner.
I have yet to try PI for processing (one day I'll get to it) but in PS i use Noise Ninga plugin as a layer, and if not used correctly can easily soften up the image.
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Ken_nneth
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Re: LBN581 in Ha

Post by Ken_nneth » Fri Jan 12, 2018 12:24 am

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Thanks guys, is the noise reduction on this image better? My eyes are playing tricks on me and I am having difficulties evaluating my own images.
Kenneth

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Re: LBN581 in Ha

Post by MikeM » Fri Jan 12, 2018 6:29 am

Hmmm.. interesting. While there is noise present, in the process you did sharpen up the image and it appears, increased the contrast. If it was me and weren't going to add an additional time to the image, then I would try and find something in between the two.
But as has been mentioned before, in order to truly smooth the image out with minimal manipulation and noise reduction, you need to add more time/subs. Preferably longer subs (300s/600s if possible) to help increase the signal/noise ratio.
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h2opolo
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Re: LBN581 in Ha

Post by h2opolo » Fri Jan 12, 2018 9:06 am

Try pulling a Lum out of it and then dropping it back in and see if it reduces your stars. If not there is a add on for photo shop for star reduction. I'll look it up the name is escaping me right now.

I got fooled a few times in the past when focusing. Look at your smallest stars when you focus and make sure they are like pinpoints. Don't look at the big ones because they will take on different shapes as you focus. As long as the tiny ones are pins you on target.
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Ken_nneth
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Re: LBN581 in Ha

Post by Ken_nneth » Wed Jan 17, 2018 12:51 am

h2opolo wrote:Try pulling a Lum out of it and then dropping it back in and see if it reduces your stars.
How do I pull a lum from a b/w image? I can't find anyting on the subject.
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h2opolo
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Re: LBN581 in Ha

Post by h2opolo » Sat Jan 27, 2018 8:48 pm

What program are you using to process your images?

If you take the time to learn Pixinsight (which I can help you with) you can pull a synthetic LUM out of it by pressing an icon and then use it to put it back into your image. Let me know or email me at my website http://www.resdstickastro.com" onclick="window.open(this.href);return false;

I'll check with a few people so I'm leading you astray but I think it can be done.
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Ken_nneth
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Re: LBN581 in Ha

Post by Ken_nneth » Wed Feb 07, 2018 2:41 am

Thanks, I am using PixInsight.
Kenneth

Celestron Edge HD 8/SkyWatcher Black Diamond ED80
Celestron f7 Reducer​
CEM60, QHY PoleMaster
SestoSenso AutoFocuser
Guiding-​ZWO OAG, LodeStar x2
ZWO ASI1600, ZWO filter wheel, Baader L,R,G,B, Ra 36mm​

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