Anyone using Deep Sky Stacker? Or other methods in removing noise from night shots...

Joined
Feb 11, 2006
Messages
6,698
Location
Riverside, CA
I shot the Milky Way last summer and forgot to take some dark frames to help map out noise, but this year I will not forget.

Now what to do with those frames?

I realize many of us have newer bodies with no noise at high ISO, but I am still using a D300. I have read that some of these software programs can look at the dark frame, compare it to the star image and remove just the noise. Otherwise without that, typical NR will remove some stars.

Has anyone figured out how to get rid of noise in these images accurately?

This? http://deepskystacker.free.fr/english/index.html
 
Joined
Jan 15, 2010
Messages
4,001
Location
UK
I know very little about astrophotography but think that it should be possible to improve in PP. Just how much improvement you will be able to get is difficult to say without seeing the original problems.

Take the following suggestions with a large pinch of salt - but it may just prove to be helpful?

1. Try up sampling the image to double the size either in PS or on a copy image in ACR.
2. Fix as much of the problem areas with colour etc with the tools available to you
3. Reduce noise with your chosen nr software. If using ACR then try the noise reduction tools there first.
4. Down sample to your original size.

In increasing the original size to double I am hoping that it will allow you to apply slightly more aggressive reduction technique without compromising the good data and that final down sampling back to original siize will disguise this work even further.
 
Joined
Oct 16, 2007
Messages
6,184
Location
Glens Falls, NY
I shot the Milky Way last summer and forgot to take some dark frames to help map out noise, but this year I will not forget.

Now what to do with those frames?

I realize many of us have newer bodies with no noise at high ISO, but I am still using a D300. I have read that some of these software programs can look at the dark frame, compare it to the star image and remove just the noise. Otherwise without that, typical NR will remove some stars.

Has anyone figured out how to get rid of noise in these images accurately?

This? http://deepskystacker.free.fr/english/index.html

I used DSS a few times last year, and got decent results. I don't do astrophotography enough to really know what I'm doing though.

Regarding you forgetting to take some dark frames -- I don't see why you can't take those frames now and run them thru DSS with the images from last year to see if your results improve. Dark frames are nothing more than shooting with the lens cap left on. How different can they be from day to day?
 
Joined
Feb 11, 2006
Messages
6,698
Location
Riverside, CA
I used DSS a few times last year, and got decent results. I don't do astrophotography enough to really know what I'm doing though.

Regarding you forgetting to take some dark frames -- I don't see why you can't take those frames now and run them thru DSS with the images from last year to see if your results improve. Dark frames are nothing more than shooting with the lens cap left on. How different can they be from day to day?

As you shoot more, your sensor heats up, and noise increases. Last year I was using a borrowed D700, so I don't have access to it at the moment, but its a thought.
 

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