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'...
Caleb's user avatar
  • 31.7k
16 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 ...
Euri Pinhollow's user avatar
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 ...
tittaenälg's user avatar
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 ...
vsis's user avatar
  • 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 ...
RadOD's user avatar
  • 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 (...
Jindra Lacko's user avatar
  • 5,990
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 ...
Michael C's user avatar
  • 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 ...
Zeiss Ikon's user avatar
  • 7,141
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 ...
Itai's user avatar
  • 103k
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 ...
Michael C's user avatar
  • 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 ...
mattdm's user avatar
  • 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 ...
Michael C's user avatar
  • 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 ...
Adam Gold's user avatar
  • 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 ...
WayneF's user avatar
  • 12.9k
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 ...
Alessandro Amato del Monte's user avatar
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 ...
xiota's user avatar
  • 27k
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 ...
JerryTheC's user avatar
  • 3,023
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 ...
AJ Henderson's user avatar
  • 34.9k
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 ...
ths's user avatar
  • 7,171
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....
Duncan C's user avatar
  • 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.
Michael C's user avatar
  • 175k
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 ...
Tim Campbell's user avatar
  • 3,937
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 ...
Michael C's user avatar
  • 175k
3 votes

autofocus shown in viewfinder and captured on actual pic is different

Some possible reasons the focus distance in the image was closer to the camera than where the autofocus point used was superimposed on the scene at the time the image was taken: You locked focus and ...
Michael C's user avatar
  • 175k
3 votes

autofocus shown in viewfinder and captured on actual pic is different

Focus (both auto and manual) can be surprisingly complex and errors are more noticeable at short distances and narrow depth of fields. In addition to possible user error, there are a number of ...
user10216038's user avatar
  • 2,239
3 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 dark image for noise reduction is taken under the same conditions as the original image and the images are subtracted. Long exposure noise is highly dependent on sensor temperature, so if you ...
user98068's user avatar
  • 926
3 votes

Would a different body help me with noise reduction?

Other than the one stop or so you gain when going from an APS-C sensor to a FF sensor, the difference between different camera models is fairly incremental. From one generation to the next of the same ...
Michael C's user avatar
  • 175k
2 votes

How to cancel halfway Noise Reduction Process in Canon Rebel T3i?

I had the exact same camera as you and experienced that too. There's no way to interrupt the process barring pulling the battery out. Even if you pull the memory card the camera will still try to ...
Hairy Dresden's user avatar
2 votes
Accepted

When stacking images to remove noise in astrophotography, should the exposure be the same in each?

I am a little confused about whether the images to be stacked are all taken at the same shutter speed, aperture and ISO or is it similar to HDR, in that I would need to take several different ...
Caleb's user avatar
  • 31.7k

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