22
votes
Can I use a single RAW file with stacking to reduce noise?
Can I get the same result by coping a raw ( same exposure ) file many times and stacking to reduce noise as I would if I used many separate exposures?
No. If you stack copies of the same image, you'...
- 31.7k
21
votes
Accepted
Why is there the illusion of detail in photographic noise?
While there may be truth to the principle that noise adds the illusion of detail, in this example I think you are misinterpreting what you are looking at.
If I remove all the noise in its lower ...
- 13.6k
15
votes
Accepted
Why doesn't noise reduction have any effect in Rawtherapee?
You can only preview noise reduction in RT when you zoom image to 100%, even in latest version.
Many other tools have same limitations for previewing, they are marked with small "1:1" label near ...
- 4,815
13
votes
Can I use a single RAW file with stacking to reduce noise?
You cannot. Removing noise via photo stacking works on the principle that the noise in your images is random, and appears in different places of the image between exposures. When you stack multiple ...
- 774
8
votes
Why is there the illusion of detail in photographic noise?
Noise is random, it causes gray values to fluctuate from one pixel to the next. This is then random information present at the smallest scale in the picture. If you remove it, then it gives the ...
- 3,596
7
votes
Will stacking more images produce more detail in this galaxy photo?
Stacking more images reduces noise to signal ratio, but don't add resolution or details.
In order to enhance resolution, my advice is to use a prime lense, instead of a zoom one. Even if it has less ...
- 1,251
7
votes
Will stacking more images produce more detail in this galaxy photo?
Yes, but No.
Your question is will it produce more detail, and yes stacking more images will reduce noise which will let you see more detail. And at least as important, you are taking calibration ...
- 101
5
votes
What ISO to minimise noise for long exposures with a tripod mounted DLSR?
Generally, the best performance is on your camera's native ISO. This is usually ISO 100, but not always - some Fuji cameras use ISO 200 (go figure..). Check your manual.
For decently lit subjects (...
- 6,010
5
votes
Does any software do denoising on Raw files before demosaicing?
Except for dark frame subtraction, which helps get rid of (non-random) pattern noise,no noise reduction is done at the pre-demosaiced level. There are simply too many variables that come between the ...
- 2,341
5
votes
Accepted
Does any software do denoising on Raw files before demosaicing?
darktable has a "raw denoise" module that does noise reduction before the demosaic step. In practice, it is rarely better than the other modules that work on the demosaiced image.
Most noise ...
- 1,683
5
votes
Accepted
Can a DSLR take a better photo (less blurry and less noisy) of artworks than a Point and Shoot Camera (Nikon B500)?
There's an old saying about photography:
Gear doesn't matter.
While true, it is only part of the fuller truth:
Gear doesn't matter... until it does.
What that means is that better gear won't make ...
- 175k
5
votes
Will stacking more images produce more detail in this galaxy photo?
In my limited experience (back when Astrostack was the hot item, and using video captured at 640x480 with a webcam -- call it 1998 or so), stacking more frames will decrease the appearance of noise by ...
- 7,113
5
votes
Issues with dark frame subtraction: Dark frames adding "noise" and changing image color/tint
You misunderstand the purpose of dark-frame-subtraction. While it is a technique used to reduce noise, it only reduces noise that is consistently output from the sensor. Any read noise due to the ...
- 103k
4
votes
Does any software do denoising on Raw files before demosaicing?
Demosaicing and noise reduction should be done simultaneously. It's best to use the DCRaw program to extract the raw pixel data and then to tackle the problem of reconstructing the image from first ...
- 3,596
4
votes
Why doesn't noise reduction have any effect in Rawtherapee?
Many previews in image editing applications are just that - previews. To get an exact view of what many effects and settings applied to an image will look like you should export the image with the ...
- 175k
4
votes
Are there Lightroom plugins for noise reduction which work on RAW data?
It sounds like you want to use an alternate noise reduction algorithm integrated into Lightroom's RAW conversion, as an alternate for or addition to the built-in noise reduction.
I don't think there ...
- 143k
4
votes
Accepted
Is Sensor Noise Consistent Between Cameras of the Same Model?
Even the same exact camera will not demonstrate the same "exact" noise characteristics on successive shots. But techniques such as "dark frame subtraction" or other noise reduction processes that ...
- 175k
4
votes
Very noisy image, looks like stars
Some cameras have a 'long exposure noise reduction' setting which should eliminate hot pixels and reduce digital noise. Two exposures are taken in immediate succession, the first with the shutter open ...
- 101
4
votes
While using Long exposure noise reduction, is it okay if i move the camera after taking the shot, when the camera is doing the noise reduction?
The camera shutter is closed then, during the extra noise processing to examine the dark space. So moving the camera then will not affect the picture, the shutter is closed, and the Viewfinder is ...
- 12.9k
3
votes
What is optimum setting for capture in night from moving objects, when diaphragm is fixed?
Actually, there are four things you can modify - in addition to shutter speed, ISO and aperture, as mentioned in the other answers, you can also modify the lighting (assuming your subjects are ...
- 3,003
3
votes
What is optimum setting for capture in night from moving objects, when diaphragm is fixed?
You cannot beat physics.
You have three variables to play with to adjust exposure: Aperture, time, and ISO (which, i'll assume, you mean with "gain"). Since your aperture is fixed, you can only ...
- 7,151
3
votes
Image Stacking for noise reduction using MATLAB
Image stacking is a process by which you can reduce noise, but it doesn't work by adding the images together additively, but rather averaging them. The reason that stacking works is that signal from ...
- 34.8k
3
votes
How do I remove noise in the sky portion of my photo?
Some of the below repeats parts of other answers. Apologies for that...
The higher the ISO, and the longer the shutterspeed, the more noise you're going to get.
Some cameras are better than others....
- 266
3
votes
Accepted
Can I switch off long-exposure noise reduction on my Canon SX530?
Based on the note on page 74 of the PowerShot SX530 HS User Guide and absent of any instructions as to how to disable it, I would say there is no way to disable this using the official Canon firmware.
- 175k
3
votes
Why aren't there any cooled CCD sensors to reduce noise?
I've been making digital cameras since 1994, continuously. We currently have a line of security cameras. Up till recently, there wasn't a particularly good reason to add a cooler to a moderate range ...
3
votes
Where does this noise come from and how to get rid of it
Many of darktable's algorithms are significantly different from those typically used by other image processing programs. If you cannot get the results you want from darktable, consider trying other ...
- 26.9k
3
votes
Where does this noise come from and how to get rid of it
My guess is you're using denoise (profiled). If so, then you should read darktable's manual section on profiled denoise.
At the time of my original reply the recommendation was to use 2 instances of ...
3
votes
Can a DSLR take a better photo (less blurry and less noisy) of artworks than a Point and Shoot Camera (Nikon B500)?
It isn't so much the camera body itself (that's just a sensor) -- it's more about the lens (photographer's understanding of the task is always important as well).
Mostly what the DSLR camera body ...
- 3,897
3
votes
Accepted
What's the best noise reduction method to use with RAW files in an open source image processor?
Why my RAW is noisier than Jpeg?
Because the JPEG created by your camera included the noise reduction contained in the camera's raw processing engine. When you work with the raw file in another ...
- 175k
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