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 ...
- 5,553
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 ...
- 1,261
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
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 ...
- 176k
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 (...
- 5,988
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 ...
- 7,229
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
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 ...
- 176k
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 ...
- 144k
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 ...
- 176k
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
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 ...
- 3,987
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
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 ...
- 27.1k
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 ...
- 3,033
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 ...
- 35k
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 ...
- 7,209
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
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 ...
- 176k
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 ...
- 176k
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 ...
- 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 ...
- 936
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 ...
- 176k
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 ...
- 456
2
votes
Does any software do denoising on Raw files before demosaicing?
Take a look at DxO Optics Pro, their DxO PRIME denoise feature works exclusively on RAW photo, and it's like black magic :).
Main drawbacks:
For supported camera only, most DSLR are supported; no ...
- 141
2
votes
How to stack low light shots (in Photoshop)
Assuming all the layers are aligned correctly, if you select them all and create a smart object, then with it selected select layer/smart objects/stack mode/median.
For dark frames use blending mode ...
- 349
2
votes
Black level unchanged after long exposure noise reduction
Noise reduction is concerned with maximizing the Signal-to-Noise Ratio (SNR) by differentiating between actual signal and signal created by noise. With a lens cap on the camera there is no signal in ...
- 176k
2
votes
Image Stacking for noise reduction using MATLAB
Your noise may not be zero mean, but the larger issue is that you are adding to a uint8 array. These values go up to 255, and will overflow likely by the second image.
You should do your ...
- 2,455
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