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Questions tagged [noise]

Image perturbation caused by electronic transformation and processing.

2
votes
3answers
306 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? ...
1
vote
1answer
134 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 ...
1
vote
1answer
121 views

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 ...
5
votes
2answers
75 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 ...
0
votes
2answers
164 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 ...
3
votes
1answer
109 views

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 ...
0
votes
1answer
60 views

How exactly do I use RawDigger to evaluate signal-to-noise?

I have a trial copy of RawDigger installed, and I understand that for my purposes I should shoot the same subject at different apertures to see if the SNR decreases at faster settings. But how ...
1
vote
2answers
52 views

Is there a way to use B&W conversion to reduce noise

My understanding of noise is that it's caused, effectively, because photos aren't evenly distributed accross time. So if you are shooting in low light, you get more noise because there aren't enought ...
3
votes
1answer
149 views

Red noise in lower edge and corners

I would like to ask for your opinion whether in your past experience you have seen similar kind of red noise in lower parts of your pictures in low-light settings? It shows up in lower edge and ...
4
votes
3answers
200 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 ...
13
votes
2answers
3k views

Signal to Noise Ratio over the years

I've been enjoying Marc Levoy's Lectures on Digital Photography and have reached this point. Marc has broadly said: Sensors have got better at reducing noise But pixels are gotten smaller so there ...
2
votes
2answers
164 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 ...
0
votes
2answers
140 views

D800 suffering excessive noise at low ISOs

I have previously owned a D610 and I find the image quality of the D800 to be somewhat inferior. The following at 1:1 crops that are much more noisy than the d610. The following were shot at ISO 800 ...
12
votes
3answers
2k views

Do mirrorless cameras have more sensor noise because they are constantly exposed to light?

I have been wondering if the following is true and the implication for mirrorless cameras. DSLR camera sensors are only exposed to light when the picture is taken, so the sensor presumably produces ...
-4
votes
3answers
186 views

What is wrong with this photo? [closed]

I just got a new camera (Panasonic ZS60) and I've been running into a few problems/questions while testing. Mostly it seems like leaves have a low-resolution, watercolor-like appearance in low-light ...
4
votes
4answers
2k views

Multiple copies of the same exposure, but randomizing the noise?

As a budding astrophotographer, I find my results are still largely hit or miss. Sometimes the standard procedure of stacking multiple exposures to randomize the noise and boost the signal works ...
1
vote
2answers
128 views

RAW (.dng) on my Phone (OnePlus 5) vs on Picasa 3 (Noisy)

I recently took a long exposure shot of the sky at night on my OnePlus 5. The RAW image when viewed on phone turned out to be great, pitch black sky and white-red-blue stars! Pretty excited, I decided ...
8
votes
3answers
1k views

How to avoid the grainy background in sunset picture?

I was taking this picture of the sunset. I used auto focus, but the trees are not really that focused. Also, the red background is grainy. Any tips if I get this opportunity again? I was using a ...
-4
votes
4answers
443 views

Why do cameras include very high ISO settings even though they are so noisy?

Why do they make DSLRs' ISO settings go so high? I own three different Nikon cameras and every one of them, once you pass a pathetic 320 ISO, the noise in my photos is lousy and — all 3 cameras cost ...
2
votes
3answers
152 views

What do I need to change to prevent this denim looking grain/noise in my product photos?

I'm an amateur and I'm reading everything that I can to learn how to take decent product photos and get the best out of the equipment that I have... My question is specifically, what is likely causing ...
2
votes
2answers
131 views

Maximize noise?

Usually when I take photos I try to minimize the noise levels in the image. However, what if I want to maximize the noise or generate an image of pure static, like the snow on a TV screen? Is there a ...
3
votes
1answer
75 views

What should I look for in a phone camera to get results with less noise in HDR photos?

I have a Samsung J7 (2017) phone and am happily shooting HDR photos with it, with the Pro HDR Camera app. I'm happy with the results except for the noise level. I think my noise problems occur in low-...
5
votes
4answers
844 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 ...
1
vote
7answers
379 views

How do I know which combination of aperture and shutter speed yields enough light to have pictures with minimal noise?

This is a kind of continuation of this question. I'm shooting a poorly lit object. Camera has fastest ISO value of 3200. I set aperture to some specific value and don't alter it, the object is ...
9
votes
7answers
4k views

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. ...
1
vote
4answers
495 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'...
0
votes
2answers
442 views

Cold camera, less noise? [duplicate]

In electronics, one of the most significant sources of noise is heat, usually in the form of infrared radiation. Everything gives off infrared radiation, and the hotter something is, the more ...
-1
votes
1answer
97 views

How does an iPhone 7 take 4K and slow motion videos? [closed]

Even some good compact cameras at around $400 range cannot take a 4K and slow motion, so does an iPhone with small sensor that is generally prone to noise shooting 4K now? A small sensor should ...
1
vote
2answers
488 views

What online tools exist to compare image noise between different sensor sizes?

I am currently thinking about upgrading my Canon SX720 with 1/2.3-inch sensor to a compact camera such as Canon G9X Mark II with 1-inch sensor. Before doing that I want to look at some samples images ...
2
votes
2answers
3k views

Seeing a lot of noise when editing in RAW

I'm editing some RAW images using RawTherapee, and after editing I'm seeing a significant amount of noise that wasn't present in the original RAW image. I'm increasing the exposure, contrast, and ...
-1
votes
4answers
3k 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 ...
0
votes
1answer
138 views

At what exposure times do fixed pattern noise become apparent?

I have been studying into photographing the night sky. I have subsequently come to learn of the technique of dark frame subtraction to reduce fixed pattern noise. So I am curious as to what is the ...
8
votes
5answers
826 views

Photostacking - Why does this technique fail for my astrophotos?

Last week I went to Tahoe to do some astrophotography. I watched this video (https://www.youtube.com/watch?v=Rydg7JGTAbw) about image stacking to reduce noise in my photos so I decided to give it a ...
3
votes
1answer
109 views

Is this image artifact to be expected and is there a name for it?

I noticed that when I underexpose a subject at relatively high ISO (e.g., 1000) and I adjust the exposure in Lightroom, a slight artifact will sometimes appear. I was wondering if this is normal or if ...
3
votes
3answers
2k views

What causes this weird grid pattern in my picture?

I have a Canon 10D DSLR. Sometimes I get weird patterns in my pictures. What causes this pattern, and how can I eliminate or prevent it?
3
votes
1answer
352 views

In-camera downsampling and ISO-equivalent noise

I have a Sony body with a 24MP APS-C CMOS sensor. It will store images in the following resolutions: 6000x4000 (24MP) 4240x2832 (12MP) 3008x2000 (6MP) When comparing the 24MP and 6MP cases, it's ...
0
votes
1answer
244 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 ...
3
votes
1answer
164 views

Why is my frame stacked image showing a grid?

The following is an auto-equalised image of 200,000 stacked frames from a small web camera. All the frames are of a very dark grey uniform background, and the histogram mode is about -1.5 stops below ...
3
votes
2answers
441 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...). ...
7
votes
1answer
2k views

Strange pattern in picture

I took a picture this weekend with my Canon 450D, and I noticed an area with a strange pattern: What could possibly be causing this? Does it come from the sensor? Feels to me like it's the physical ...
1
vote
3answers
2k views

How to reduce color noise in Darktable?

Photo worth a thousand words is below. Summary: Darktable generates a lot of color noise which is really hard to remove in color photography. Why is that? How to fight it?
3
votes
4answers
605 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 ...
-1
votes
1answer
182 views

Photos get noisy when uploaded to either photoshop or Lightroom

I'm facing one thing that is very frustrating. Every time that I upload long exposure images to either photoshop or lightroom, they get blue and red specs,and when I export them (no matter which ...
0
votes
2answers
647 views

Does the body of Nikon D750 make clicking sound/noise when moving it up and down?

I just got a brand new Nikon D750 body. However, I found that the package has a lot of room to move around so I don't know if there was any damage done to the camera body during the shipping. When I ...
4
votes
5answers
4k views

At what point does the Canon 5D Mark IV's high-ISO performance give it higher real resolution than the 5DS (R)?

I want the sharpest images with the most detail possible. Resolution increases detail (to a limit) Noise decreases sharpness Therefore, I have a dilemma. I am looking to purchase a new DSLR: either ...
1
vote
2answers
244 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 ...
2
votes
2answers
80 views

Noise & Blue Speck in A Priority Nikon D5200

So, I took this shot indoors (bright sunny outside) using on a Nikon D5200 with A priority and Auto ISO: Photo looks ok when zoomed out. But when I zoom 1:1 in LightRoom, I see some blue specks in ...
1
vote
3answers
470 views

How can I reduce digital noise while exporting from Lightroom?

I particularly shoot images during morning or evenings as those conditions are favourable for landscape in my region, but while retouching the raw files in lightroom, I came across tons of digital ...
3
votes
4answers
363 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 ...
0
votes
1answer
644 views

Is there a way to determine a camera's quantum efficiency?

I need to know my camera's quantum efficiency for a research project which involves the usage of a Nikon Coolpix A10. Is there some way to know it?