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LBN581 in Ha

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Ken_nneth

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Dielectric Constant

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Location: Orre, Norway

Post Wed Jan 10, 2018 12:38 am

LBN581 in Ha

Image
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.
Ken
Kenneth

Celestron Edge HD 8/SkyWatcher Black Diamond ED80
Celestron f7 Reducer​
Sky-Watcher AZ-EQ6 GT, QHY PoleMaster
Guiding-​ZWO OAG, LodeStar x2
ZWO ASI1600, ZWO filter wheel, Baader L,R,G,B, Ra 36mm​
https://www.flickr.com/gp/[email protected]/2nAcp7
SGP,PI
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DkN

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Giant Molecular Cloud (GMC)

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Post Wed Jan 10, 2018 8:25 am

Re: LBN581 in Ha

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.
Jeff

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Europa

Solar Nebula

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Post Wed Jan 10, 2018 8:39 pm

Re: LBN581 in Ha

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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gardenfish

Hypergalaxy

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Post Thu Jan 11, 2018 4:59 am

Re: LBN581 in Ha

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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Black Hole

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Post Thu Jan 11, 2018 10:14 am

Re: LBN581 in Ha

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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Post Thu Jan 11, 2018 10:59 am

Re: LBN581 in Ha

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.
Clear Skies!
Mike

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G11
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Ken_nneth

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Dielectric Constant

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Location: Orre, Norway

Post Fri Jan 12, 2018 12:24 am

Re: LBN581 in Ha

Image
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

Celestron Edge HD 8/SkyWatcher Black Diamond ED80
Celestron f7 Reducer​
Sky-Watcher AZ-EQ6 GT, QHY PoleMaster
Guiding-​ZWO OAG, LodeStar x2
ZWO ASI1600, ZWO filter wheel, Baader L,R,G,B, Ra 36mm​
https://www.flickr.com/gp/[email protected]/2nAcp7
SGP,PI
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MikeM

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Magellanic Cloud

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Post Fri Jan 12, 2018 6:29 am

Re: LBN581 in Ha

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.
Clear Skies!
Mike

AT8RC -- FSQ-106N
G11
Atik 383L+ - EFW2 - OAG
Image
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h2opolo

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Black Hole

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Post Fri Jan 12, 2018 9:06 am

Re: LBN581 in Ha

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.
Carbon 127, GSO RC-8, Stellarvue 130 EDT, WO GT71 & Zenith Star 61
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Ken_nneth

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Dielectric Constant

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Joined: Mon Dec 26, 2016 12:45 am

Location: Orre, Norway

Post Wed Jan 17, 2018 12:51 am

Re: LBN581 in Ha

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.
Kenneth

Celestron Edge HD 8/SkyWatcher Black Diamond ED80
Celestron f7 Reducer​
Sky-Watcher AZ-EQ6 GT, QHY PoleMaster
Guiding-​ZWO OAG, LodeStar x2
ZWO ASI1600, ZWO filter wheel, Baader L,R,G,B, Ra 36mm​
https://www.flickr.com/gp/[email protected]/2nAcp7
SGP,PI
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h2opolo

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Black Hole

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Location: Louisiana

Post Sat Jan 27, 2018 8:48 pm

Re: LBN581 in Ha

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 www.resdstickastro.com

I'll check with a few people so I'm leading you astray but I think it can be done.
Carbon 127, GSO RC-8, Stellarvue 130 EDT, WO GT71 & Zenith Star 61
Losmandy G11G
NEQ6, ST80, Lodestar X2,
QSI 690 & 683
Astrodon Ha, SII, OII, LRGB
Shoe size 11.5

Website http://www.redstickastro.com
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Ken_nneth

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Dielectric Constant

Posts: 54

Joined: Mon Dec 26, 2016 12:45 am

Location: Orre, Norway

Post Wed Feb 07, 2018 2:41 am

Re: LBN581 in Ha

Thanks, I am using PixInsight.
Kenneth

Celestron Edge HD 8/SkyWatcher Black Diamond ED80
Celestron f7 Reducer​
Sky-Watcher AZ-EQ6 GT, QHY PoleMaster
Guiding-​ZWO OAG, LodeStar x2
ZWO ASI1600, ZWO filter wheel, Baader L,R,G,B, Ra 36mm​
https://www.flickr.com/gp/[email protected]/2nAcp7
SGP,PI

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