Questions tagged [noise]

Image perturbation caused by electronic transformation and processing.

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Is there any data or theory about human visual system to identify details under noise?

For one clean image, one person can identify every details at first. Then white Gaussian noise is added to the image. With low noise level, one person can still identify every details even though ...
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Could somebody help me understand this paragraph explaining the relationship between noise and sensor size?

According to this article from dpreview, which compared noise between a full-frame camera with a full-frame lens (the D810), the same full-frame camera with an APS-C lens, and an APS-C camera with the ...
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If you double ISO and halve shutter duration, how would it affect SNR?

Assuming the SNR is shot limited. Would it be the square root of 2 because of the shutter speed?
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Do my photos look blurrier on a newer, higher-resolution camera body because my lens has a problem?

I have a Canon EF 100-400 1:4.5-5.6 L IS USM (the old version, not the II) zoom lens, which I often use for bird photography. I used to have a Canon 10D body, which I used in combination with this ...
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Why does my ISO 1600 picture have a grainy background?

My camera is a Sony a6000. The picture is taken at f6.3, 1/1000, ISO 1600, 210mm. Why is it grainy in the background and how do I fix it?
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I have an image problem and I don't know what to call this

I wrote the article using a translator and hope you understand well, Sorry... I am developing machine vision using basler camera(acA2440-20gm). A problem arose during development. The image contains ...
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Sensor resolution and ISO performance [duplicate]

I keep hearing that less megapixels = better ISO performance, because larger pixels capture more light Suppose I shot something with a 4MP sensor and then downscale it to 1MP (4-to-1 pixel binning?)....
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I am shooting video at 200 ISO but the video is still really noisy. Any ideas on how to fix this?

I'm using a Sony Alpha A58 and I am shooting at 25 fps. My settings are ISO 200, F5.6, 1/50. The video is noisy in general but more in the darker areas such as black wall e.t.c. Any ideas? Thanks!
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weird vertical lines in low light settings on my Canon 70D

When I record or take photos I get these really weird vertical lines going down my image in the shadows. How to I fix this? I don't have it on a high ISO.
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Photo noise level in RAW format [duplicate]

Why is the noise level of raw photos higher than jpeg photos? I have encountered this issue several times.
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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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What is the cause of these colored dots?

I recently bought a used Canon 6D with the 24-105 f/4 L USM kit lens. After shooting some outdoor pictures at night, I noticed some colored pixels or dots in the images, especially at longer exposures ...
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Noise reduction, upload to shutterstock declined

would you be able to help please with any feedback on the photo I've taken. I've tried to submit it to the Shutterstock but it was rejected with the following comment: Noise / Film Grain: Content ...
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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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why i have black rectangles on my photo?

Original photo Edited photo to better show rectangles sony a6000 iso 100 3.2 f/5 sigma 60 mm (90mm for aps-c)
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Why is the North America Nebula so hard to see on this astrophoto?

Parameters: Canon EOS 70D, astromodified Canon EF 100–400 mm f/4.5–5.6 L IS Astronomik UHC filter iOptron Pro mount + bar with 1.5 kg counterweight + Slik travel tripod ISO 1000 150 mm f/5 50×13"...
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Where are these maze-like noise patterns coming from in this tit photo? [duplicate]

I was just editing some tit photos I made on our balcony, and I found really strange patterns of noise over the bird's feathers: The photo is from Nikon D5600, settings 85mm F4.0 1/1000 ISO 160 These ...
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8 votes
1 answer
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What texture is used in this photo?

I want to know what texture is used in this photo. If you zoom in on the lighter parts of the photo, there seems to be some little tiny digital bubbles/circle type things (some type of grain or noise?)...
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White noise spots on our IP Camera, is it faulty?

Can anyone help us solve what could cause white noise spots on the images from our IP camera? There is only one light source - the window above door. Is the camera faulty? We keep getting ...
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a6400 Red circle (light / flare) when getting close to darker subject

I run into a little issue today and can’t figure out the root cause. I have the a6400, when I get close to a subject, mostly black / dark fabric type of material, I will see a red dot (light / flare) ...
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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 ...
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Why does zooming into JPEG images show chunky boundaries and or noise resembling smudges of magenta, yellow and cyan?

What causes this effect? The boundaries look chunky and weird. I never seen this on PNG. I also have noticed this for JPEG images only, not PNG. For example these captcha images. The skies don't ...
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Why am I getting horizontal stripes/bands on sensor?

I am experiencing an issue with very apparent stripes on camera readout. Over time, a very pronounced stripe/band pattern started appearing and has a significant impact on image quality. The camera is ...
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Why do Bayer images of total darkness contain stripes?

The following is a raw Bayer image from a Raspberry Pi's camera (v.2):- It was taken in complete darkness, so the image simply represents all of the various noises that accumulate on a CMOS photo ...
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Lightroom and noise / grain

I have this issue with lightroom, when it adds grain / noise after exporting photo. The original picture is a lot better then processed. And the particularly wierd thing is that often, right after ...
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6 votes
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How do I prevent intensive red noise on a deep-sky photo?

This is a fragment of my recent photo of the pinwheel galaxy (M 101): As you can see in this enlarged (200%) detail, the image is full of red noise, which makes all red objects (M 101 has several ...
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Is my sensor dying?

Please check this 100% crop of a night sky. I shot this on a Nikon D750 with a Nikkor 50mm f/1.4 D @ f/8, ISO 100, RAW format. I had already noticed that kind of noise / hot pixels (all these small ...
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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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Is it normal for "modeling flash" to cause taser sounds in Nikon D80 with its built in flash?

I turned on the modeling flash option in my Nikon D80 It makes my built in flash into a temporary flashlight when I hold down the Depth OF Field button. Both the aperture stops down and the flash is ...
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Noisy sky with Nikon d600

I have a question regarding the shot I attached. I tried taking a pic of this landscape, but no matter how I played with the iso, going as low as 400, the sky looks really grainy if zoomed even just a ...
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4 votes
2 answers
506 views

Will a Nikon D810 give me more fine detail than a D610 for macro enlarged shots?

I do a lot of photography that focuses on tiny details usually with marine animals such as coral. I am in need of a camera that produces a photo, that even when enlarged from a macro point, it retains ...
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1 vote
3 answers
390 views

How can a camera with a small sensor have better low-light performance than a camera with a bigger sensor?

In Potato Jet's video comparing the Canon M50 versus the Panasonic G7, you can see at 8:51 that the Canon M50 has a more noisy image in low light compared to the Panasonic G7, even though the M50 has ...
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How to avoid noise in Aperture Priority mode arising due to auto-ISO?

I was taking photos of birds in a cloudy day and in an area of forest where light was even low under a tree as compared to other areas. I used 70-300 mm kit lens. When trying to take photo even at 1/...
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4 answers
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Why do I get noisy results when converting from raw to jpeg?

I am using ACDSee Photo Studio Professional 2019 and shooting with a Canon 80D (storing raw+jpeg files from the camera). In the past I've shot mostly jpeg files and fine-tuned them in ACDSee with ...
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1 answer
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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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6 votes
1 answer
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Long exposures create red noisy glow.. but only with one of my lenses. Why?

I recently started having a problem with long exposure (30 sec +) photos having a pattern of red noise. The problem started in the middle of a camping trip - long exposure pictures looked fine one ...
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22 votes
7 answers
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Is it true that "only photographers care about noise"?

I have been doing a lot of research lately in planning an upgrade to my old D70. One thing that has really jumped out at me is that I've seen the same general phrase repeated on three different ...
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How to get rid of brighter dark areas of the object while taking photo or by editing it later?

I'm having a little hard time taking photos of my pencil drawings. I recently posted a question about noise & blurriness. Here the thing is, my art looks much better on paper but when I take ...
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Photos taken with Canon ef2 24mm lens on a Canon 200D are incredibly noisy

I Just purchased a canon 24mm lens that i am using on my Canon 200D. The first few test shots I took came out full of noise. I just assumed that this was a lighting issue (dimly lit room) but after ...
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2 answers
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What is causing these stripes in my images?

Please don't mind the edited faces. All over the image are visible white stripes horizontally. What could cause them? The image was taken without a flash on a Canon 5D Mark II. Could this be a sensor ...
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2 answers
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What causes this leather-grain pattern of noise in the sky when I inspect with a sharp mask?

Noticed these strange patterns in the sky while adjusting sharp masking with "alt" key in Lightroom. In normal mode picture seems alright (and exported variant looks normal too), but I can't be sure ...
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2 votes
2 answers
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Which ISO should I use for the cleanest image? [duplicate]

Assume the case of a Canon 6D Mark II. Its lowest ISO is regulary 100. If expanded, I can set it to L, which is ISO 50. Until now, I was always under the impression the lower the ISO the cleaner the ...
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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? ...
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2 votes
1 answer
909 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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1 answer
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Why is same image exposed at 100 ISO noisier than 3200 ISO? [duplicate]

I used to believe that ISO adds noise as a drawback to increasing exposure, but after researching the topic I arrived at the conclusion that it is a misconception. By amplifying the existing signal ...
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5 votes
2 answers
262 views

dB ratings for sensor SNR, what do they specify exactly?

I find the use of dB values to specify sensor properties confusing.. A rating of 20dB SNR at a given ISO setting could mean, assuming a reasonably linear system: RMS noise voltage and thus luminance ...
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0 votes
1 answer
860 views

Will a full frame camera reduce noise vs. my Canon T7i for high school wrestling and football?

I’m looking to get my first Canon full frame. I mostly take photos of high school wrestling and night football. I would like to stay around $1000. Currently I have a T7i. Is there any advice as to ...
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6 votes
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Why does a non-linear relationship exist between noise level (of dark frame) and ISO setting

According to Does changing the ISO of a modern digital camera really change the gain of an electronic amplifier?, the ISO physically amplifies signal in analogic way, so it is more effective than ...
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