Image perturbation caused by electronic transformation and processing.
74
votes
4answers
3k views
What is “ISO” on a digital camera?
What is "ISO" in general, and how is the scale defined?
How does the ISO scale for film speed differ from ISO sensitivity as used in digital cameras?
Is lower ISO always better?
19
votes
2answers
1k views
What is noise in a digital photograph?
What kinds of effects are present in digital images that are referred to as "noise"?
What are the different sources of noise?
What causes each type of noise?
What are the characteristics of the ...
19
votes
8answers
2k views
How can I reduce the noise present when taking pictures without lowering my ISO?
I know that high ISOs tend to produce more noise, and some cameras' software can handle that noise better than others, but are there any other settings or conditions tha affect visible noise?
I'm ...
22
votes
3answers
2k views
Why is the blue channel the noisiest?
It is widely observed that the blue channel in digital cameras is the noisiest. I've certainly noticed that with my camera. Why is this?
Is it an artifact of some particular technology (e.g. Bayer ...
7
votes
2answers
521 views
How to test noise?
I'm just looking for what's the best technique to test for noise on a camera.
Like what settings are best? What type of photo is best? What lenses should I test with? Like those sorts of things. ...
10
votes
3answers
717 views
Does the order of sharpening and noise reduction matter?
I have been shooting for more than three years, but I never do too much in post-processing. I tend to be strict and keep in mind that PP can only do little to save an otherwise-great photo.
I was ...
6
votes
4answers
801 views
Does noise in images depend upon “Megapixels” or “ISO”?
I have a question about image quality. Does noise in an image is depends upon "Megapixels" or on "ISO"?
10
votes
11answers
599 views
What noise removal tools work best, and why?
Can anyone recommend some good noise removal tools, free and commercial? Should support RAW and JPEG. Are certain tools better than others in particular situations? Do some integrate better with other ...
2
votes
1answer
343 views
What algorithms or example tools are there for denoising of images in Raw format?
I am trying to perform some post-processing of Camera Raw images captrued using my Canon EOS 450-D. I am using PS CS5 and GIMP particulary to remove noise which is present in images.
My questions is:
...
7
votes
3answers
200 views
Is Poisson Noise (“Shot Noise”) a significant source of noise for typical photography?
In this answer, @jrista states that even a camera with a perfect, noiseless sensor would still have noise due to "Poisson noise" aka "Photon Shot Noise" - noise caused by the random variations of ...
7
votes
2answers
546 views
Why are sensors less sensitive to blue light?
This is a followup question to Why is the blue channel the noisiest?. The simple answer to that question is that sensors are less sensitive to blue, and therefore require more amplification, which ...
4
votes
1answer
321 views
what's the relation between sensor size and image quality (noise, dynamic range)?
I'm reading this description on sensor size:
Digital compact cameras have substantially smaller sensors offering a
similar number of pixels. As a consequence, the pixels are much
smaller, ...
2
votes
2answers
165 views
Is there software for detecting noisy areas in a photograph?
I have been told that this photograph contains noise and is muddy. It is difficult for me to identify noise in a photograph until it is in extremes.
Are there any softwares available which detect the ...
1
vote
3answers
280 views
Why is there too much noise in a fog photograph?
I have been told that this photo has terrible noise.
I wasn't aware of this fact! :redface:
Morning scene, F4.8, Shutter: 1/50, ISO 100, Focal 14.4mm.
The fog was dense of course, but still it ...
