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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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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140 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 ...
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113 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 ...
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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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1answer
413 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 ...
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270 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 ...
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0answers
197 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 ...
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1answer
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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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1answer
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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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1answer
167 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 '...
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3answers
357 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.
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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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792 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 ...
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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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2answers
185 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, ...
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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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2answers
519 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. ...
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9answers
1k 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 ...
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1answer
256 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 ...
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1answer
457 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 ...
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1answer
447 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 ...
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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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1answer
582 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 ...
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1answer
441 views

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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4answers
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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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2answers
330 views

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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2answers
146 views

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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4answers
943 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 ...
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1answer
162 views

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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7answers
897 views

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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2answers
1k views

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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95 views

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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3answers
1k views

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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2answers
3k views

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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2answers
495 views

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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2answers
431 views

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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2answers
768 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.
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2answers
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 ...
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4answers
636 views

How much does noise reduction let me increase ISO without a visible decrease in quality?

When I take low-light photos with my Sony NEX-5R, I find that I stick to ISO 200 to ensure acceptable noise. I was told that fear of ISO will hold me back, and that I should do noise-reduction in ...
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3answers
4k views

Does median blending / image stacking result in better or worse results than a long exposure?

For night photography, do long exposures work better or worse than taking a few photos and merging them in software (median blending / image stacking, like the excellent iOS app Cortex Camera)? You ...
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3answers
16k views

Can I merge multiple photos to reduce noise?

This is not about HDR, exposure fusion, or any kind of bracketing (exposure, focus, ISO, what have you). There's an excellent iOS app called Cortex Camera that takes a couple of dozen photos in a ...
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2answers
169 views

Image stacking with different camera settings

I'd like to be able to stack multiple images to reduce noise. In the past, I've followed the approach found at Cambridge in Colour: averaging images. Simply put, I bring all of the images into ...
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5answers
559 views

Is this amount of noise expected, or am I doing it wrong?

The picture below is a crop (at 1:1 scale) of a photo I just took. It was taken with a Canon 7D and the 24-105mm F4 lens (RAW, F4, ISO 2500, 1/160s). It looks properly exposed to me, so where is all ...
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2answers
1k views

How can I completely avoid noise for stock photography with my Canon 650D?

I bought the Canon 650D about six months ago and have taken almost 1000 photos with it todate. I always shoot Raw+ jpg so I never really had the need to process my Raw files until now when I got ...
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5answers
16k views

How to remove white spots from a scanned picture?

I have a photo and I scanned it, but the scanned version introduced a lot of white spots on the image. I think the problem is the type of paper of the photo, which is not smooth a bit rough. There's ...
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1answer
2k views

Why is there a vertical lines pattern in noise?

Take a look at this image (shot with a Nikon D60). The shadows have been aggressively brightened to make the noise clearly visible. If you look closely, you'll see that the noise is not completely ...
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3answers
9k views

Is “Active D-Lighting, NR” a necessary evil?

Are the settings "Active D-Lighting, NR" in Nikon DSLR necessary evil or should this be turned off (managed through image editor)? What is the effect of this setting on processing time and battery ...
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3answers
2k views

Reducing noise in very high ISO photos

On the weekend I attended a wedding and took my camera along. I was not the official photographer -- just a guest. My camera is a Canon 5D Mark III, and I was using an EF 50mm f/1.4 USM lens. At ...
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3answers
2k views

Why is sharpening not recommended in RAW processing? [duplicate]

I was reading this article A Simple Workflow for RAW Processing. I noticed that sharpening is not recommended (only noise reduction is), as it should only be the final step before publishing. However, ...