elmarkidaz

If you zoom in on try6.jpg, this pattern in the darks. (It looks the same on a desktop but right now it’s easiest to show using my phone’s screen capture.)[ATTACH=full]1367691[/ATTACH]

Oh ok, I didn't noticed that, it only appears there on the jpg, on the complete .tiff on GIMP it doesn't appear

It's post production.

Something that specialist astro software can deal with automatically.

 

Not so easy in GIMP or PhotoShop.

 

Having said that; setting 'Long Exposure Noise Reduction' does much the same with some cameras. It doubles the exposure time while the camera takes a blank frame.

Ok, I will search if there is a software that can do a good job on that, thank you

There's a pattern across the whole frame, I don't know where it came from but it looks like the "worms" you get when you use Adobe on a Fuji raw file took a growth hormone overdose. I don't know if it came from the raw conversion or the noise reduction or something GIMP did or what but I have to assume it's coming from software.

Hello, where do you see those "worms"? O.o

Hello @conrad_hoffman and [uSER=2403817]@rodeo_joe|1[/uSER] , I found that the best option for me was to start with Nikon Caprure NX-D and already start just a little bit of noise reduction there with the correct camera settings, then save the Tiff 16bit file, then edit it in GIMP.

I got a somewhat decent picture, there is still plenty of noise that i can't get rid of, but I think that I still have everithing to learn from shooting correctly at night to the variety of things that I can possibly do during editing.

Would appreciate if you have other suggestions.

I attach the (probably) final picture, thank you.

Thank you [uSER=2403817]@rodeo_joe|1[/uSER] for the explanation! I will also try this method in the weekend

Thanks, i will let you know

Since you have a Nikon, try Nikon Capture NX-D. You should be able to duplicate your jpeg, and then do better!

Thank you, I will install it in the weekend when I get back to the windows pc, because it's not available for Debian. I will let you know

Hard to tell from those but my very limited experience with astro shots was that noise reduction was fussy and sometimes the camera manufacturer could do a better job with the jpegs than I could with the raw. With my Nikon, I think their PC raw processing program had a special checkbox for astro images. You have to get the dynamic range just right and not over-sharpen, as that makes the noise stand out. What camera are you using? Can you post a link to a raw image?

@conrad_hoffman Hello, thanks. I tried with the dynamic range on RawTherapee but it still have a lot of noise. I noticed that here the two pictures seems similar and not bad, but on RawTherapee it's basically a totally red picture, i even tried on two different pc with totally different specs...

I have a Nikon D5600.

Can I post the raw picture there on the forum? Or else how can i attach it?

JPEG images, which are what you see in Win Image Viewer (urrrgh!), are processed to include vignetting correction - the dark outer circle - and noise reduction.

 

 

If these enhancements are applied to the RAW file to same degree, then you'll end up with exactly the same looking image as what you see in Image viewer.

 

 

You need to understand that a RAW file is exactly what it says; a file containing the raw data direct from the image sensor. That's as good as it gets. Warts and all.

 

 

The whole point is that a RAW file can be processed to remove those warts far more thoroughly than what can be done with the camera's limited CPU power. And to make use of the full bit-depth captured by the camera. This is usually 12 or 14 bits and gives far more flexibility for enhancement than the 8 bit limit of a JPEG image file.

 

 

Bone up on the possibilities of high bit-depth image processing, and you'll see the advantage of shooting RAW. But not if you just let lame default adjustments apply themselves.

 

 

P.S. Top quality RAW processing software, like CaptureOne, can produce results that blow away anything you can get straight out of the camera.

[uSER=2403817]@rodeo_joe|1[/uSER] Thanks, I used Windows Image Viewer only to know wich picture to edit :) Thanks for the explanation about the raw format and the different processes.

But now, how can I get a picture that actually looks good as the jpeg one or even better? Do you know any good guide for noise reduction in post-production of night photography?

@mikemorrell thank for the answer

Hello,

I'm new to this community and software photo editing.

Those were my first Milky Way pictures from a year ago and now I tried to edit them.

For editing at the moment I'm using GIIMP + RawTherapee.

I know that raw pictures can look a bit bad sometimes and not like on the camera preview or the jpg, but those looks like two completely different pictures.The raw on RawTherapee is really bad, all noise, strage colors and a circle effect.

.

The preview on camera and the Windows photo ones looks similar and pretty good to me.

The first is the RAW, the second is the Windows Photo viewer(both are low quality screenshots especially the second).

Do you know how I can edit it correctly to look like the preview one? Because it looked like a good starting point to edit.

Thank you.

(edit) Here watching in little and low quality, the raw seems not that bad..

,