Questions tagged [noise-reduction]

noise is generally undesirable in photography, and many photographers want to try and reduce it when taking photographs. Noise reduction tends to be about preventing noise in the first place, where as noise removal is a description of post-processing techniques for dealing with noise that is in a photograph.

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3 answers
122 views

Would a different body help me with noise reduction?

I've been spending time shooting people ballroom dancing under subdued lighting (without a flash or other lighting controlled by me). The kit I have been using for doing this is my Nikon D7500, ...
1 vote
3 answers
270 views

Can a DSLR take a better photo (less blurry and less noisy) of artworks than a Point and Shoot Camera (Nikon B500)?

These photos are taken from my Nikon B500 Point and Shoot camera. See the Orange marks here. The area nearby these marks is not well photographed. I guess you might not see much difference but as I ...
11 votes
4 answers
2k views

Will stacking more images produce more detail in this galaxy photo?

I've just started doing a bit of astrophotography and finally after the third night of trying I found my target, the Whirlpool galaxy. I'm pleased I've managed to capture it but I'm looking into how I ...
0 votes
0 answers
53 views

Long exposure with interval and noise reduction

I'm interested about long exposure (4+ minutes) using a camera that does not allow to disable noise reduction and only allows 2 minute long exposure at most. Would I be better off taking a few 2-min ...
5 votes
2 answers
471 views

While using Long exposure noise reduction, is it okay if i move the camera after taking the shot, when the camera is doing the noise reduction?

I am using a nikon d5600. When i turn on the Long exposure NR, the camera takes as much time after the photo to process it, as the actual photo duration . I understand that this is because it takes ...
4 votes
4 answers
549 views

Where does this noise come from and how to get rid of it

I am using Darktable as my RAW processing software. In darker pictures that have been taken with an ISO of 800 or more, I frequently encounter great issues with luminance noise. The following two ...
1 vote
0 answers
239 views

Noise reduction showing no change at any zoom

I'm using RawTherapee and none of the noise reduction sliders make even the slightest difference, no matter how far I slide them. I've tried it at all different zoom levels, including 100% (the one I'...
5 votes
4 answers
712 views

Issues with dark frame subtraction: Dark frames adding "noise" and changing image color/tint

While editing some landscape shots with stars, I tried to use darkframes to reduce the noise. More precisely, my approach was to take a series of shots, then firstly to subtract dark frames from each ...
0 votes
0 answers
123 views

Good Low Noise Long Exposure Astrophotography camera?

Recommendations: I was reading that Canons were the best at low noise long exposure photographs. Then I found this site, https://www.brendandaveyphotography.com/more/long-exposure-sensor-testing/ It ...
1 vote
2 answers
123 views

Very noisy image, looks like stars

Yesterday I did some long exposure shots, and it turned out to go quite well (in my opinion), just one issue is that the image is very noisy like I've never seen before. The noise looks like stars, ...
1 vote
0 answers
119 views

How to remove this noise (color patches)?

I'm having images with a visible color noise taking form of color blocks: One can reveal the patches with modular multiplication (x -> x*d%255, ...
6 votes
2 answers
4k views

Why doesn't noise reduction have any effect in Rawtherapee?

I am processing some raw images from my Canon camera. I am using Rawtherapee on a Mac desktop. When I try to apply noise reduction, the changes are not taking place, or at the very least are not ...
1 vote
1 answer
213 views

Digitizing slides with a camera: still too much noise

Third episode of my odyssey to digitize our entire family slides collection. If you want to know all the details of the project, I invite you to check my two other posts but here is a quick recap of ...
2 votes
3 answers
736 views

autofocus shown in viewfinder and captured on actual pic is different

Equipment : Nikon D7000, Godox Flash on camera with soft box diffuser. Background: I have been assigned the task by my family to make portrait albums of the identical twins born to my close relative. ...
5 votes
3 answers
1k views

How to reduce large, agressive color noise?

I tried to shoot an image of Comet C/2020 F3 last night. My settings were ISO 6400, f/5.6 and Shutter speed 2 seconds at 175mm on a MFT camera. As expected, there is a lot of noise, so I planned to ...
1 vote
2 answers
2k views

What's the best noise reduction method to use with RAW files in an open source image processor?

I have been fighting with the noise reduction of the following image in darktable: I used this website: https://tomassobekphotography.co.nz/articles/reducing-noise-in-Darktable.php and tried all the ...
0 votes
3 answers
248 views

How do cameras convert colorful noise to colorless?

Modern phones have some amazing processing of the data from their cameras. For example, the raw image below of a sculpture in a park after sunset (demosaiced using IGV method in RawTherapee and ...
12 votes
4 answers
13k views

Astrophotography picture with too much noise. How do I correct this in postprocessing?

This is the Milky Way above Kakadu National Park, Australia, and my first try at astrophotography. Thirty second exposure, f/4.0 at 17mm with ISO 12800 (!!) which in hindsight probably was way too ...
27 votes
6 answers
4k views

What is ETTR (Expose To The Right)?

Picking up from this answer and this question, What exactly is ETTR? How it may reduce the image noise? And how is it difference from film to digital sensors? In the answer linked above, what are the ...
5 votes
2 answers
169 views

Is Sensor Noise Consistent Between Cameras of the Same Model?

The RAW photo editing program Darktable has a "Denoise - profiled" filter which reduces image noise by using a noise profiles for your camera model and ISO submitted by other users: The darktable ...
0 votes
2 answers
208 views

How to set focus when subject is more than one object?

I have taken a photo with men dancing in a group. It was rejected by an agency stating: "The main subject is not in focus and grain noticed in the photo". Below I am giving the cropped image. Since ...
28 votes
5 answers
2k views

Is there any noise difference between averaged and long exposure photos?

Let's suppose I'm on a tripod, photographing a perfectly still scene (also dark) and I take these photos: 5 photos at ISO 3200 and 1s exposure 1 photo at ISO 100 and 5s exposure There is a common ...
21 votes
10 answers
2k views

How do I reduce noise, given that I have complete control over everything else?

I want to take some pictures of some crystals. Being crystals, they don't move around much so I can set up my camera and lighting as I like. I have a high-powered halogen light shining on them, and ...
0 votes
1 answer
751 views

How Does Noise Reduction Work In Canon EOS 1300D?

I have been reading review of the Canon EOS 1300D by The Digital Picture and I came across noise reduction. The color blocks in this tool, being evenly-colored, provide a worst case scenario for ...
2 votes
1 answer
1k views

How to reproduce camera noise reduction using open source software?

I have unsuccessfully tried to reproduce the camera's (Canon EOS 2000D) noise reduction algorithms using open source software when post-processing RAW (.CR2) files. Specifically, the camera's noise ...
36 votes
3 answers
16k views

Why does storing a long exposure photo take almost as long as the exposure time itself?

Last night I took some night sky shots, and I've noticed that with long exposure times (15s, 30s) the time it took to store the images in the camera memory card (jpeg) took roughly as long? The ...
5 votes
4 answers
2k views

Does any software do denoising on Raw files before demosaicing?

Part of a combined effort for "social" and "spontaneous" photography is to use a compact mirrorless camera and available light. I've looked at a few tools for noise reduction including Neat Images ...
1 vote
0 answers
274 views

How can I best post-process underexposed, noisy images taken at 5000 iso?

I'm editing photos but the photographer was quite new and he took photos using Olympus OMD EM5II at 1/400, ISO 5000 and at f3.5 resulting in a underexposed noisy image. (The photos are raw.) I tried ...
1 vote
1 answer
583 views

How to cancel halfway Noise Reduction Process in Canon Rebel T3i?

I accidentally had Noise Reduction on Long exposure turned on in my Canon Rebel T3i. I took a 2 hours exposure and then the noise reduction kicked in and I was banned from using the camera for 2 hours ...
3 votes
1 answer
2k views

Are there Lightroom plugins for noise reduction which work on RAW data?

I'm wondering if there's any plugin or 3rd party software for Lightroom which lets me reduce noise on RAW image data directly? I'm currently using Define2 from Nik Collection for Lightroom but it ...
2 votes
1 answer
439 views

How does in camera dark frame noise reduction work?

There are several questions and a tag relating to what it is but I can't find much relating to how it is actually done in camera anywhere. The internet reveals many "how to" pages for doing the ...
11 votes
2 answers
5k views

Why do my photos look like they're painted?

I'm not an expert, but all the photos I take look like they've been painted. It doesn't look like normal blur. I'm using a FinePix S2500HD and the following photo was taken at 1/2000 exposure. I ...
3 votes
2 answers
314 views

Black level unchanged after long exposure noise reduction

I took 2 raw photos with the lens cap on: One with Long Exposure Noise Reduction turned on, one with LENR turned off. Checking the tags in the Raw file, BOTH report black levels of [200, 200, 200, ...
7 votes
2 answers
867 views

Do low ISO photographs need Long Exposure Noise Reduction?

I usually took long exposure photo with ISO 100, so do I really need to turn on Long Exposure NR on? It really take time for processing.
4 votes
3 answers
832 views

Why is dark-frame subtraction on my Pentax camera shorter than the exposure time?

When my Pentax K-r applies long exposure noise reduction (dark-frame subtraction), the processing time required for this operation is less than the exposure time. For example, my camera may perform ...
17 votes
5 answers
14k views

Does "long exposure noise reduction" option make any difference when shooting RAW?

I can configure my camera (5D) to use long exposure noise reduction (dark frame is exposed and subtracted), but is this method really effective when shooting RAW? Or is the actual subtraction only ...
2 votes
2 answers
962 views

How to stack low light shots (in Photoshop)

I want to take a picture of a very dark scene with the help of all the noise reduction tricks you would use when shooting stars: stacking multiple exposures, using dark frames, bias frames an so on. ...
7 votes
1 answer
235 views

At which point do cameras scale photos down when using quarter sensor resolution?

My Nikon D5600 sensor can deliver 24MP but I configured it to just use 6MP. At which step in the process does the camera "scales" the images down? Maybe already at sensor level? By calculating an '...
-1 votes
3 answers
593 views

What is the best way to reduce high ISO noise? [duplicate]

Even on a 5D ISO noise is a challenge. I use PS raw photoshop and Adobe Bridge. I want to minimise loss of image quality.
1 vote
2 answers
4k views

Noise in JPEG file after processing RAW file in photoshop

Recently i started shooting in RAW after understanding its advantages over JPEG format. While processing the RAW file there is an option to reduce noise in a captured picture. It works great when i ...
0 votes
3 answers
1k views

Image Stacking for noise reduction using MATLAB [closed]

I'm new to Image processing and started using MATLAB for Astrophotography processing. I'm trying to process 10 corrupted images (Same Image but mixed with different noise) of Planet Saturn using ...
0 votes
3 answers
96 views

What is optimum setting for capture in night from moving objects, when diaphragm is fixed?

I have a camera and I want to capture real-time photos continuously from moving objects in night. my problem is if i reduce exposure time, image will be all black, but with higher exposure, objects in ...
2 votes
3 answers
410 views

What ISO to minimise noise for long exposures with a tripod mounted DLSR?

I often find myself taking still pictures of some gizmo using a tripod mounted DLSR. One decision that always vexes me is what ISO to set my camera to and so minimise sensor noise. The important ...
3 votes
9 answers
2k views

How do I remove noise in the sky portion of my photo?

So I went out and took some pictures of an eagle flying, and I thought they would have been great photos. But after getting home and loading the RAW image, and doing some editing, I exported the image ...
0 votes
1 answer
310 views

Noise reduction in Adobe Camera Raw

When I open a raw file shot in ISO 1600 in ACR there is very little noise in the photo. But after color adjustments when i save or export as a JPG file there is much more noise visible. How can I ...
16 votes
4 answers
6k views

Why aren't there any cooled CCD sensors to reduce noise?

Sensor cooling is a common technology to get less noise. Why isn't it available on high-end D-SLRs ? (see http://www.andor.com/scientific_cameras/ikon-m_cooled_ccd/ for an extreme example) I'm not ...
2 votes
1 answer
575 views

Can I switch off long-exposure noise reduction on my Canon SX530?

I've been experimenting a bit with some long exposure shots on a Canon SX530 HS, and have noticed that it takes twice as long as the exposure time to actually shoot anything (2 seconds taking, 2 ...
3 votes
3 answers
4k views

Can I use a single RAW file with stacking to reduce noise?

Can I get the same results by copying a RAW (same exposure) file many times and stacking to reduce noise as I would if I used many separate exposures?
15 votes
4 answers
3k views

Why is there the illusion of detail in photographic noise?

I have the following image which contains noisy mountains. In the lower part of the image, the signal-to-noise ratio is too low to contain actual details, but when I remove all the noise from this ...
2 votes
1 answer
705 views

When stacking images to remove noise in astrophotography, should the exposure be the same in each?

I am trying to get to grips with astrophotography and have read about image stacking to help reduce noise. I am a little confused about whether the images to be stacked are all taken at the same ...