Noise that is made apparent by increasing the ISO setting. This noise is primarily random "photon shot" noise, and usually has little to do with the electronics of the camera.
2
votes
1answer
68 views
Signal:noise ratio not really decreasing with ISO for Pentax
In SNR graphs for Pentax K-30 and Pentax K5 there is something I do not get.
For ISO after 1600 the SNR doesn't really decrease. Moreover comparing with Nikon D3200, we can clearly see that until ISO ...
3
votes
3answers
4k views
Which noise reduction software has the best results?
Have you tried different software, compared the results and reached a conclusion?
I only used Nikon's DFine and Lightroom's noise reduction tool and found the results very similar. Lightroom's has ...
19
votes
8answers
856 views
Should higher ISOs really be preferred (all other things being equal)?
My understanding of the ISO setting on digital cameras is that, unlike film-cameras, changing the ISO does not evoke any physical change in the camera. Rather, it simply tells the camera to multiply ...
0
votes
0answers
131 views
Using noise reduction and sharpening in LR4 [duplicate]
When using these two features in LR4 for global adjustments, I normally start with noise reduction and keep sliding till the "pixels" are removed. I then increase sharpening to the point right before ...
2
votes
3answers
1k views
Noise Issue / Canon 5D Mark II
Just curious if anyone can help with this?
I am using a Canon 5D Mark II and it seams to be having noise issues at ISO 250 and up and especially at ISO 400? What is going on?
In low light when my ...
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 ...
2
votes
2answers
95 views
Which is the factor that creates noise in a photo? [duplicate]
Possible Duplicate:
What is noise in a digital photograph?
This happens while talking photos on dark or night. The Black color is not black, it has some noise. What would be the reason for ...
1
vote
6answers
542 views
Is noise related to shutter speed as well as ISO?
I understand that as I increase ISO, I'll increase the amount of noise in the resulting image. With a constant aperture I can decrease ISO and slow the shutter speed (assume a non-moving subject, ...
4
votes
3answers
679 views
How to make the faces clear and bright in dim light photography?
I have a Fujifilm Finepix S2980 with which I do a lot of experiments.
One thing which really bothers me is taking pictures in dim light.
I wish to take decent quality pictures in dim light without ...
4
votes
4answers
491 views
Is higher ISO noise evenly distributed, or does it affect colors differently?
It's obvious that higher ISO affects the photograph by adding noise or grains.
But will that grain or noise be distributed equally over all parts of the photograph, or will it specifically affect ...
7
votes
4answers
880 views
Astrophotography picture with too much noise. How do I correct this in postprocessing?
This is the Milky Way above Kakadu National Park, Australia, and my first try at astrophotography.
Thirty second exposure, f/4.0 at 17mm with ISO 12800 (!!) which in hindsight probably was way too ...
8
votes
3answers
485 views
How does averaging images or lowering resolution reduce noise?
This answer lists 3 techniques to reduce noise:
Keep the camera's sensor cool.
Take a burst of photos, then average them.
Lower the resolution.
Can someone shed more light about the last two ...
9
votes
3answers
795 views
Why aren't there any cooled CCD sensors to reduce noise?
Sensor cooling is a common technology to get less noise. Why isn't it available on high-end D-SLRs ?
(see http://www.andor.com/scientific_cameras/ikon-m_cooled_ccd/ for an extreme example)
I'm not ...
11
votes
2answers
493 views
What exactly is “base ISO” and how do I find what is base ISO on my camera?
If I understood correctly, base ISO is in full stop steps from the lowest possible ISO setting on my camera. For example if the lowest setting on my camera is ISO 100, than the following table would ...
5
votes
3answers
1k views
How to best filter away high ISO noise in Gimp?
So I took a picture at a high ISO value in poor light conditions. I can't retake it, the grain effect is bad, I'm aware this will never be a good photo, but I still want to make the best out of it. ...
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?
5
votes
3answers
395 views
Why am I getting such high noise when using ISO 320/640?
I'm taking photos at night with a GH1 at ISO 640 and getting a ton of noise in the dark areas.
I've seen a bunch of other peoples night time photos and they never have this much noise. I tried using ...
3
votes
2answers
953 views
Why do the 600D/7D sensors have more noise at high ISO than 5Dmk2 or 1Dmk4?
Hi I'm wondering why the high ISO performance in a 5Dmk2 or 1Dmk4 is so much better than a 600D or 7d? I've been trying to photograph the milky way galaxy and when I use an ISO of 6400 I have an ...
18
votes
5answers
684 views
Is there any noise difference between averaged and long exposure photos?
Let's suppose I'm on a tripod, photographing a perfectly still scene (also dark) and I take these photos:
5 photos at ISO 3200 and 1s exposure
1 photo at ISO 100 and 5s exposure
There is a common ...
4
votes
1answer
150 views
What makes a good sample image for ISO comparison?
To be more specific this image is always used by Digital Photography School for ISO comparison. What are those features that make this image suitable for ISO comparison.
13
votes
3answers
2k views
What are the pros/cons of the high-ISO noise reduction feature on D90?
So my D90 offers "High-ISO Noise Reduction". Sounds like a good thing, but obviously there must be a cost of some kind. The settings are "Off", "Low", "Normal", and "High", and the default is ...
4
votes
1answer
376 views
What do the different noise reduction options in Silkypix mean?
I'm playing around with RAW files in Silkypix that came with my Panasonic camera and I am thoroughly confused by the sliders for the noise reduction and the Silkypix manual isn't of much help (at ...
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"?
11
votes
1answer
312 views
What is the statistical distribution of sensor noise?
Sensor noise is a random variation in pixel values, but what kind of random is it? Does it follow a normal distribution, one of the gamma distributions, or something funky like an F distribution?
...
6
votes
3answers
803 views
Loss of image quality after sensor cleaning?
I use a 550D for photography. I got dust in my sensor few days ago while I was doing reverse macro and cleaned it from Canon Service Center. After cleaning I checked my sensor (taking picture of blue ...
9
votes
1answer
254 views
Are hot pixels just one pixel?
I have been taking a few astro photos on a very high ISO, and have found what I think to be a few hot pixel. I though at first that I had managed to get a few very sharp pic of some red and blue ...
20
votes
8answers
2k views
How much “noise” is acceptable in a photograph?
I've been at photography for a little over a year, and I primarily do landscape and wildlife/bird photography. Most of my work has been a learning experience so far, with few shots actually something ...
