Questions tagged [noise]

Image perturbation caused by electronic transformation and processing.

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What is "ISO" on a digital camera?

What is "ISO" in general, and how is the scale defined? How does the ISO scale for film speed differ from ISO sensitivity as used in digital cameras? Is lower ISO always better?
mattdm's user avatar
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1 answer
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Is it really better to shoot at full-stop ISOs?

The second half of this answer says Notice that I only shot full-stop ISO which is important with Canon DSLRs because the gain to obtain the 1/3 stops in between is applied in software by the ...
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32 votes
2 answers
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What is noise in a digital photograph?

What kinds of effects are present in digital images that are referred to as "noise"? What are the different sources of noise? What causes each type of noise? What are the characteristics of the ...
Martin's user avatar
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49 votes
7 answers
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Is it better to shoot with a higher ISO, or use lower ISO and raise the exposure in post-processing?

Suppose there are two photos taken in the following scenario: Scenario 1 - Photo taken using ISO of 3200. Scenario 2 - Photo taken using ISO of 100. Both photos are taken in a medium light scenario....
Jack's user avatar
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10 votes
6 answers
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Why would using higher ISO and faster shutter speed yield more noise than using lower ISO and slower shutter speed?

I'm trying to see how this answer correlates with practice. That answer basically says I need to let enough light into the camera and then use the highest ISO value and I'll get the lowest noise then. ...
sharptooth's user avatar
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7 votes
2 answers
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Is analog gain really actually power-of-two only?

Context I'm using a Nikon D5200, which features extra ISO values between powers of two, that the Nikon D60 did not offer. D60 offers 100, 200, 400, 800, 1600 (1-stop interval). D5200 offers two ...
Stéphane Gourichon's user avatar
15 votes
11 answers
2k views

What noise removal tools work best, and why?

Can anyone recommend some good noise removal tools, free and commercial? Should support RAW and JPEG. Are certain tools better than others in particular situations? Do some integrate better with other ...
gabr's user avatar
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33 votes
4 answers
9k views

Why is the blue channel the noisiest?

It is widely observed that the blue channel in digital cameras is the noisiest. I've certainly noticed that with my camera. Why is this? Is it an artifact of some particular technology (e.g. Bayer ...
mattdm's user avatar
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6 votes
1 answer
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what's the relation between sensor size and image quality (noise, dynamic range)?

I'm reading this description on sensor size: Digital compact cameras have substantially smaller sensors offering a similar number of pixels. As a consequence, the pixels are much smaller, which ...
cody's user avatar
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5 votes
2 answers
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Why do RAW images in Darktable have a lot of noise?

I installed the latest version of Darktable from the Ubuntu PPA from their homepage (1.6.8). When I import RAW ges from a folder they all seem to have a lot of noise. I opened the exact same images ...
Martin's user avatar
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3 votes
3 answers
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What is the highest acceptable ISO to use for weddings with Canon 7D? [closed]

I recently had my first wedding shoot(yippie!). For a person like me who usually shoot still life and landscape, weddings is a whole new world. I am used to shooting at low ISO's (800 or less) but the ...
ides's user avatar
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24 votes
8 answers
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How can I reduce the noise present when taking pictures without lowering my ISO?

I know that high ISOs tend to produce more noise, and some cameras' software can handle that noise better than others, but are there any other settings or conditions tha affect visible noise? I'm ...
Jaydles's user avatar
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12 votes
3 answers
13k views

Continuous Bursts of Many Short Exposures vs. A Few Long Exposures for Astrophotography?

When reading many sources that address doing astrophotography, I often see the advice to take multiple exposures and stack them rather than one long exposure. Often the reason given is that the longer ...
Michael C's user avatar
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2 votes
1 answer
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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 ...
juhist's user avatar
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10 votes
3 answers
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Is Poisson Noise ("Shot Noise") a significant source of noise for typical photography?

In this answer, @jrista states that even a camera with a perfect, noiseless sensor would still have noise due to "Poisson noise" aka "Photon Shot Noise" - noise caused by the random variations of ...
BlueRaja - Danny Pflughoeft's user avatar
9 votes
2 answers
3k views

How to test noise?

I'm just looking for what's the best technique to test for noise on a camera. Like what settings are best? What type of photo is best? What lenses should I test with? Like those sorts of things. I'...
Vian Esterhuizen's user avatar
8 votes
7 answers
6k views

Does noise in images depend upon "Megapixels" or "ISO"?

I have a question about image quality. Does noise in an image is depends upon "Megapixels" or on "ISO"?
subeer haldar's user avatar
5 votes
4 answers
2k views

How much of digital sensor noise is thermal?

Is all digital sensor noise thermal? And what is the relationship between temperature and noise? For example, as we cooled a CMOS towards absolute zero, would we discover that high-ISO images would ...
feetwet's user avatar
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14 votes
3 answers
9k views

Does the order of sharpening and noise reduction matter?

I have been shooting for more than three years, but I never do too much in post-processing. I tend to be strict and keep in mind that PP can only do little to save an otherwise-great photo. I was ...
Gapton's user avatar
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13 votes
3 answers
1k views

Why is my camera drawing labyrinths on my photos?

On the photos where the lens flare is present, my Nikon D7000 is drawing strange labyrinth-looking artifacts. Here's an example. The first image is a screenshot of a little part of the original photo ...
Arseni Mourzenko's user avatar
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 ...
BioGeek's user avatar
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3 votes
2 answers
478 views

How to get bright concert photos?

I've been starting to shoot some live music recently and have been doing an okay job and see an improvement with each time I shoot. However recently I was shooting and all of my photos have come out ...
Jayy's user avatar
  • 31
2 votes
3 answers
2k views

Can we always talk about noise difference between crop and full frame?

Let's say we have two systems: 1) full-frame camera, 80 mm lens at f/2.2 2) APS-C camera, 50 mm lens at f/1.4 The subject is the same, as well as the camera position, focus distance, shutter speed ...
Sunny Reborn Pony's user avatar
0 votes
6 answers
736 views

Is the low-light advantage of larger sensors attributable to the sensor itself or to the larger aperture of the lenses? [closed]

Let's say I take a photo using an APS-C camera and using an FF camera, from the same position, with the same ISO and shutter speed. Let's say I use a 50mm focal length for the FF camera. To match the ...
Kartick Vaddadi's user avatar
-1 votes
4 answers
6k views

Why RAW to JPG creates more noise in image in Adobe Photoshop? [duplicate]

When i click image at that time Raw format doesn't contain any noise, but when i opened into Adobe Photosho CC 2017 version and after modifying raw data and open to ps ans save as jpg gives colors ...
Parth's user avatar
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20 votes
5 answers
2k views

Might future advances in sensor technology reduce or eliminate noise?

Is there a possibility that future tech advances may reduce or eliminate the noise when using high ISO setting, or is this noise unavoidable and inherent to all digital sensors? If there is a ...
angel rojas's user avatar
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9 votes
2 answers
5k views

Why are sensors less sensitive to blue light?

This is a followup question to Why is the blue channel the noisiest?. The simple answer to that question is that sensors are less sensitive to blue, and therefore require more amplification, which ...
mattdm's user avatar
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7 votes
5 answers
7k views

How can I tell if two pictures were taken with the same camera without metadata?

Is it possible to identify images (without exif data) and link them to the exact same camera? If so, I'd like some software recommendations to get the job done. I have two photos that I'd like to ...
jman's user avatar
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6 votes
1 answer
619 views

When is high ISO noise not noticeable?

I noticed that sometimes when taking pictures with my D5100, they come out with very little visible noise with ISO 800 and up, for example this picture. It was taken at ISO 1600 if I remember ...
hak8or's user avatar
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4 votes
5 answers
603 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 ...
user avatar
4 votes
6 answers
12k views

Do different lenses affect noise level?

I unfortunately got a very poor and cheap 18-55mm lens on my Canon 60D. In addition to poor quality of my photos (poor in comparison with my 50mm f/1.8 Lens which makes great pictures) the noise level ...
SERAJ's user avatar
  • 350
2 votes
2 answers
655 views

Does shooting at lower MP result in less image noise? [duplicate]

My Sony a65 has a 24MP and 10MP mode. Will shooting at 10MP result in less image noise? I'm looking to do more night photography.
Carlos Justiniano's user avatar
2 votes
3 answers
1k views

Does lower resolution result in better signal-to-noise ratio, given the same sensor size?

With the release of the Canon EOS R5/R6, there have been many saying that they prefer the 20MP R6 camera over the 45MP R5 camera, due to its lower price but also because of "better low-light ...
Skeleton Bow's user avatar
2 votes
4 answers
2k views

Are these stars or noise?

Tonight I decided to take a couple of shots with my Nikon D3200 on a tripod for the first time. When I was looking at them on my computer, I noticed these dots. Are these stars or just noise? I highly ...
Tardigrade  Snake's user avatar
1 vote
2 answers
471 views

Grain and noise: will full frame solve this?

I have a Canon 600D with a Canon 70-200 f/4L (non IS). Now, when it's sunny and bright the images are splendid, but as soon as it becomes a tad cloudy and gray, noise and grain starts to become ...
Tindra's user avatar
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1 vote
4 answers
368 views

How do I reduce the noise in this image / prevent noise in future images?

I'm Canon Powershot A510. I took photography as an elective, and I normally look for pictures later in the evening, as I find it more enjoyable to walk then. The problem is that - especially ...
mowwwalker's user avatar
1 vote
4 answers
736 views

Why are my low light photos noisy /blurry, but Alien is perfect?

I know that there are a few questions here already about low light photography and image noise. I want to know why Ridley Scott can shoot very low light scenes (including publicity stills), yet I can'...
Paul Uszak's user avatar
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0 votes
2 answers
97 views

What kinds of images can I produce the least noise in when shooting in low light? [duplicate]

What sort of images produce least noise?
user75798's user avatar
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11 votes
1 answer
2k views

How can an electronic shutter reduce dynamic range?

I read a recent review of a camera which can use either its mechanical shutter or an electronic shutter. The review mentions a problem they noticed with the mechanical shutter, and then notes that the ...
mattdm's user avatar
  • 143k
9 votes
3 answers
3k views

How does averaging images or lowering resolution reduce noise?

This answer lists 3 techniques to reduce noise: Keep the camera's sensor cool. Take a burst of photos, then average them. Lower the resolution. Can someone shed more light about the last two ...
K'''s user avatar
  • 6,497
6 votes
2 answers
411 views

Why does raising ISO make image quality appear lower even though my measurements suggest it shouldn't?

I know this may be rehashing one of the most discussed topics, but I would like to take it a slightly different direction and solicit input. First of all, I am familiar with the electrical ...
Jon's user avatar
  • 407
6 votes
2 answers
914 views

What is the source of this multicolored noise in these samples?

I shot many long exposure photos (from 5 minutes to 30 minutes) back in December of 2010 with a two month-old Nikon D7000 and Tokina 11-16mm f/2.8 lens. The photos I took had very little noise. I ...
bperdue's user avatar
  • 1,270
5 votes
4 answers
907 views

How should I interact with a loud amateur photog when I'm making a personal audio recording of an acoustic performance?

I was at a large prestigious high school music concert this past weekend where I wanted to record the audio on a hand-held audio recorder, as my daughter was performing with one of the groups. I was ...
Milwrdfan's user avatar
  • 159
5 votes
2 answers
863 views

Why photos taken with flash appear to have less noise?

I have not verified this on pixel-peeping level. But I have observed that photos taken with flash (built-in one in my case) appear to have very less noise at ISO 800/1600 than the ones taken without ...
Sudarshan Kadam's user avatar
5 votes
5 answers
1k views

What algorithms or example tools are there for denoising of images in Raw format?

I am trying to perform some post-processing of Camera Raw images captrued using my Canon EOS 450-D. I am using PS CS5 and GIMP particulary to remove noise which is present in images. My questions is: ...
goldenmean's user avatar
  • 1,219
5 votes
1 answer
566 views

How can a newer camera increase ISO while decreasing pixel size?

I am a bit confused as I am considering to upgrade my canon 350D to 600D. The pixel size has reduced from 6.4 microns to 4.3 microns, however, top ISO has increased from 1600 to 6400. How did that ...
Ashish's user avatar
  • 51
3 votes
1 answer
3k 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 ...
Szabolcs's user avatar
  • 2,883
3 votes
2 answers
1k views

Long exposure shots showing huge bright spot. What happened to my sensor?

Recently I noticed the appearance of a quite big spot of increased brightness and strange colour in my longer exposure photos. I'm using a Samsung NX300m (I know, not a good camera for low light...). ...
smow's user avatar
  • 1,014
3 votes
3 answers
2k views

Does red noise even at low ISO values mean a hardware problem with my camera's sensor?

I have an Canon 200D (Rebel SL). I am concerned about the red noise in the darker parts of the picture, at low ISO values. Especially in the blue sky. Could this be a hardware problem with a sensor? ...
Wedrowycz's user avatar
3 votes
2 answers
919 views

Is there software for detecting noisy areas in a photograph?

I have been told that this photograph contains noise and is muddy. It is difficult for me to identify noise in a photograph until it is in extremes. Are there any softwares available which detect the ...
Aquarius_Girl's user avatar