Alley in Pisa, Italy

by Lars Kotthoff

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7
votes
2answers
179 views

Do low ISO photographs need Long Exposure Noise Reduction?

I usually took long exposure photo with ISO 100, so do I really need to turn on Long Exposure NR on? It really take time for processing.
1
vote
2answers
139 views

Noise in JPEG file after processing RAW file in photoshop

Recently i started shooting in RAW after understanding its advantages over JPEG format. While processing the RAW file there is an option to reduce noise in a captured picture. It works great when i ...
0
votes
4answers
214 views

How much does noise reduction let me increase ISO without a visible decrease in quality?

When I take low-light photos with my Sony NEX-5R, I find that I stick to ISO 200 to ensure acceptable noise. I was told that fear of ISO will hold me back, and that I should do noise-reduction in ...
2
votes
2answers
114 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 ...
9
votes
4answers
3k 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 ...
9
votes
3answers
935 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 ...
11
votes
3answers
1k 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 ...
6
votes
3answers
3k 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. ...
5
votes
3answers
528 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 ...
4
votes
2answers
5k 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 ...
20
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 ...
4
votes
1answer
532 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 ...
11
votes
1answer
348 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? ...
21
votes
5answers
843 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 ...
13
votes
3answers
3k 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 ...