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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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 ...
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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 ...
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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'...
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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 ...
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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 ...
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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, ...
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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, x a 8 bits RGB value of a pixel, d some value, eg., ...
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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 ...
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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. ...
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4 votes
3 answers
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1 answer
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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 ...
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2 votes
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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 ...
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7 votes
1 answer
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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 '...
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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.
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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 ...
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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 ...
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2 votes
3 answers
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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 ...
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3 votes
2 answers
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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, ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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2 votes
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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 ...
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What's the relationship between chromatic aberration, ISO and long-exposure noise reduction?

I took a photo that has what seems like chromatic aberration. It's a purple color at the left and bottom edges, especially at the bottom-left corner: This is a 30-second exposure at ISO 3200 with the ...
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15 votes
4 answers
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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 ...
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Improving My Night Photography Shot with Post-Processing

I like taking landscape/architecture shots of places at night such as the Golden Gate Bridge. I've looked and found posts like these that talk about techniques on improving images from a non-FF ...
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Why does frame stacking alter colours?

I apologise in advance for the subject matter of my photos. I've not tidied the table for a few days. I needed indoor artificial lighting for the long duration of this experiment. Both images are ...
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5 votes
4 answers
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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 ...
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Combining multiple shots from a burst for noise reduction, when the subject moves slightly?

Is there a tool to use to combine a burst of exposures (to eliminate noise; all are same exposure) when the subject moves slightly and only in places? For example, you would not notice they are not ...
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How to reduce noise shown in LiveView when photographing in the dark?

At night, when I want to take photos, I usually use LiveView to focus instead of the optical viewfinder. So I set my camera on a tripod, go to LiveView and use manual focusing to get the focus. But ...
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4 votes
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How do I stack two photos in Photoshop to reduce noise?

I tried stacking two pictures in Photoshop to create a final image with less noise. But I ended up with a pic that had more. Is there any other way to stack two pictures so that there is less noise? ...
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In what kinds of images would high noise be most manageable?

In what sort of photographs does the noise least detract from the image? (The noise is that resulting from use of high ISO settings.)
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How do I most efficiently reduce noise on images from my Olympus TG-3?

On my vacation, I got a new Olympus TG-3 because I liked the feature set. But when I compare the pictures to the output of my wife's Canon Ixus 800 there is much more noise and I would even say that ...
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1 vote
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Too much "Grain" in photos [duplicate]

i'm trying to produce a few mockup pictures of a person using a tablet around the house. These are the conditions: Camera Nikon D90, Lens 18-55 The pictures were taken in the morning Indoors but the ...
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2 votes
2 answers
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In RawTherapee noise removal, why does noise apparently come back if I zoom out?

I am trying to remove noise from a picture taken at 2000 ISO on Nikon D90 with RawTherapee and have some weird results. In order to test the noise removal, I have naively pushed all the chrominance ...
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Can I recover my aurora photographs?

I really need help fixing these photos. My mom (71 yrs old) had seeing the aurora on her bucket list and so we went to Norway (from DALLAS!) to see them. We did, luckily, but the photographs all ...
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Can I activate the sensor without triggering the shutter such that a dark frame is taken?

A dark frame is usually taken by placing the lens cap on the camera and opening the shutter for a period of time to determine the noise component of the signal for a certain exposure duration. I ...
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