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33 votes

Is it true that "only photographers care about noise"?

I do expect work has been done on noise perception to build perceptual models to compress images and compare image quality. However, I am unaware of any studies that compare photographer vs non-...
xiota's user avatar
  • 27k
32 votes

Why would using higher ISO and faster shutter speed yield more noise than using lower ISO and slower shutter speed?

So I first shoot with ISO 1600 and shutter speed set to 1/125 second and then I shoot with ISO 3200 and shutter speed set to 1/250 second. The amount of light should be identical and indeed both shots ...
Michael C's user avatar
  • 175k
32 votes

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

To achieve what you're thinking of you would have to know what the noise was. If you knew what the noise was then you could just remove that to get clean images.
James Snell's user avatar
  • 9,709
28 votes
Accepted

Signal to Noise Ratio over the years

This data was iffy then — not really enough data points, and the trendline is dubious: Source: a very timely xkcd That said, the company DxOMark does measurements of camera sensors all the time, ...
mattdm's user avatar
  • 143k
27 votes
Accepted

Why is the North America Nebula so hard to see on this astrophoto?

Your exposures are very different. Ignore the quantity of images that you captured for a moment... and just compare the the single exposure settings (for reasons I'll describe in a moment). Top: 13 ...
Tim Campbell's user avatar
  • 3,957
21 votes

What texture is used in this photo?

That's a 'halftone pattern'. Halftones are a method of creating color separations for offset printing printing presses. This image was probably scanned from an offset printed piece. Offset printing ...
LightBender's user avatar
  • 3,181
19 votes

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

Image stacking works to reduce noise because the noise is random — or at least, ideally so — while the stars are (famously) constant. That means that (once you've corrected for rotation) the stars ...
mattdm's user avatar
  • 143k
18 votes

Is it true that "only photographers care about noise"?

Based on my informal study of my customer preferences and anecdotal evidences, I found that some laypersons do notice noise. 'Noise' is not a familiar term to most non-photographers but I heard my ...
raviputcha's user avatar
15 votes

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

DSLR camera sensors are only exposed to light when the picture is taken, so the sensor presumably produces less noise than if it was always exposed to the light. I find support for this in the way ...
Michael C's user avatar
  • 175k
14 votes
Accepted

How to avoid the grainy background in sunset picture?

As to the trees being unsharp: It is very difficult to tell, but I think that the autofocus decided to get the house, not the trees in focus. It really is best to specify a certain AF point (p. 61 in ...
flolilo's user avatar
  • 6,478
14 votes

Is it true that "only photographers care about noise"?

I don't think you'll find that this topic has been studied to the degree that you're looking. You may have some luck in finding a study on perception based on some tangible knowledge or background - ...
OnBreak.'s user avatar
  • 20.5k
14 votes

Why does my ISO 1600 picture have a grainy background?

It's called "photon shot noise." For a given intensity of light there is also a given amount of noise; and the noise component is equal to √(photons/time/area). So, with more light intensity/...
Steven Kersting's user avatar
14 votes

Why does my ISO 1600 picture have a grainy background?

why is it grainy in the background You chose to limit the amount of light collected by the sensor to the point Poisson distribution noise has a noticeable effect. Instead of shooting at ISO 1600, f/6....
Michael C's user avatar
  • 175k
12 votes
Accepted

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

Why are my low light photos noisy/blurry, but Alien is perfect? There's a world of difference between creating a dark image and creating an image in the dark! The scenes in a Ridley Scott sci-fi ...
Caleb's user avatar
  • 31.7k
11 votes

Is it true that "only photographers care about noise"?

Many non-photographers will appreciate a sharp, lifelike image, with a high degree of detail visible. Non-photographers may not always be able to distinguish all the different reasons why a ...
Нет войне's user avatar
11 votes

Unusable image R5 iso 1000

There are some points regarding the attached image. What happened? The most important thing is, that your image is already underexposed by about 1.5 - 2 f-stops. This also means that your image is ...
Kai Mattern's user avatar
  • 4,518
9 votes

Why are my sports team pictures fuzzy?

I do not think your photos are fuzzy,I think they are noisy. You will get the best quality image by shooting as close to the 'native' ISO as possible. For most modern dSLRS that is typically ISO 100 ...
cmason's user avatar
  • 14.8k
9 votes
Accepted

Strange pattern in picture

These are demosaicing artefacts introduced when converting the image from the bayer array that the sensor records into an image with complete colour information for each pixel. In an effort to ...
PeterT's user avatar
  • 621
9 votes

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

What you're asking about is generally called star-eating. From an algorithm point of view, in an astrophotograph, how can software determine what is signal (that is, stars) vs. what is noise? A ...
scottbb's user avatar
  • 32.9k
9 votes

Is it true that "only photographers care about noise"?

Beauty is in the eyes of the beholder. It used to be popular to shoot Kodak Royal Pan X film rated at 'ASA' 1200 (That was fast back in the day.) and "soup" it in Dektol (Kodak D-72 paper developer) ...
Stan's user avatar
  • 5,521
8 votes

Can photos taken with high ISO be fixed?

The photos can be improved, but you would have to pay a retoucher and even then with such a high iso the photos are going to look poor. Maybe pick out a few worth paying a retoucher from the actual ...
rob j crowe's user avatar
  • 1,401
8 votes

Photostacking - Why does this technique fail for my astrophotos?

You have to remap the images such that the stars are aligned precisely, this requires pixel level aligning throughout the entire picture. This is best done with specialized software, such as Hugin (...
Count Iblis's user avatar
  • 3,616
8 votes
Accepted

Why is my camera drawing labyrinths on my photos?

Anything you are viewing on the screen is not raw data. Raw image data are linear monochrome luminance values and nothing else. Anything that shows more than one color is the result of the application ...
Michael C's user avatar
  • 175k
8 votes

Why is my camera drawing labyrinths on my photos?

To confirm ben rudgers' analysis, I took the NEF file you supplied and ran it through RawTherapee. Here's an enlargement of a similar crop with no adjustments and the default "amaze" demosaicing ...
hobbs's user avatar
  • 920
8 votes

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

The quantity of photos he was taking I don't think are unfair, however, I think he should have been more aware of the noise his camera makes. On most DSLRs, the focus beep can be disabled and the ...
AJ Henderson's user avatar
  • 34.9k
7 votes
Accepted

How much of digital sensor noise is thermal?

It depends: On the sensor design, the ISO setting selected, the length of exposure, the intensity of the light entering the camera, etc. Thermal noise can be anywhere from almost none of the noise in ...
Michael C's user avatar
  • 175k
7 votes

Photostacking - Why does this technique fail for my astrophotos?

1) From the difference between median and max you can see that alignment didn't work and the pictures were not aligned. Why this is so, is hard to tell. Comparing the pictures in the tutorial with ...
Grimaldi's user avatar
  • 473

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