Alley in Pisa, Italy

by Lars Kotthoff

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noise is generally undesirable in photography, and many photographers want to try and reduce it when taking photographs. Noise reduction tends to be about preventing noise in the first place, where as noise removal is a description of post-processing techniques for dealing with noise that is in a ...

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3
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1answer
166 views

Can I recover my aurora photographs?

I really need help fixing these photos. My mom (71 yrs old) had seeing the aurora on her bucket list and so we went to Norway (from DALLAS!) to see them. We did, luckily, but the photographs all ...
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 ...
6
votes
2answers
351 views

Can I activate the sensor without triggering the shutter such that a dark frame is taken?

A dark frame is usually taken by placing the lens cap on the camera and opening the shutter for a period of time to determine the noise component of the signal for a certain exposure duration. I ...
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.
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 ...
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 ...
3
votes
3answers
2k views

Can I merge multiple photos to reduce noise?

This is not about HDR, exposure fusion, or any kind of bracketing (exposure, focus, ISO, what have you). There's an excellent iOS app called Cortex Camera that takes a couple of dozen photos in a ...
1
vote
3answers
504 views

Does median blending / image stacking result in better or worse results than a long exposure?

For night photography, do long exposures work better or worse than taking a few photos and merging them in software (median blending / image stacking, like the excellent iOS app Cortex Camera)? You ...
0
votes
2answers
98 views

Image stacking with different camera settings

I'd like to be able to stack multiple images to reduce noise. In the past, I've followed the approach found at Cambridge in Colour: averaging images. Simply put, I bring all of the images into ...
4
votes
5answers
380 views

Is this amount of noise expected, or am I doing it wrong?

The picture below is a crop (at 1:1 scale) of a photo I just took. It was taken with a Canon 7D and the 24-105mm F4 lens (RAW, F4, ISO 2500, 1/160s). It looks properly exposed to me, so where is all ...
4
votes
2answers
497 views

How can I completely avoid noise for stock photography with my Canon 650D?

I bought the Canon 650D about six months ago and have taken almost 1000 photos with it todate. I always shoot Raw+ jpg so I never really had the need to process my Raw files until now when I got ...
0
votes
4answers
1k views

How to remove white spots from a scanned picture?

I have a photo and I scanned it, but the scanned version introduced a lot of white spots on the image. I think the problem is the type of paper of the photo, which is not smooth a bit rough. There's ...
3
votes
1answer
323 views

Why is there a vertical lines pattern in noise?

Take a look at this image (shot with a Nikon D60). The shadows have been aggressively brightened to make the noise clearly visible. If you look closely, you'll see that the noise is not completely ...
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 ...
4
votes
3answers
2k views

Is “Active D-Lighting, NR” a necessary evil?

Are the settings "Active D-Lighting, NR" in Nikon DSLR necessary evil or should this be turned off (managed through image editor)? What is the effect of this setting on processing time and battery ...
5
votes
3answers
640 views

Reducing noise in very high ISO photos

On the weekend I attended a wedding and took my camera along. I was not the official photographer -- just a guest. My camera is a Canon 5D Mark III, and I was using an EF 50mm f/1.4 USM lens. At ...
0
votes
3answers
660 views

Why is sharpening not recommended in RAW processing? [duplicate]

I was reading this article A Simple Workflow for RAW Processing. I noticed that sharpening is not recommended (only noise reduction is), as it should only be the final step before publishing. However, ...
11
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5answers
4k views

Does “long exposure noise reduction” option make any difference when shooting RAW?

I can configure my camera (5D) to use long exposure noise reduction (dark frame is exposed and subtracted), but is this method really effective when shooting RAW? Or is the actual subtraction only ...
5
votes
4answers
2k views

Does the Canon 7D have noise reduction, and does it matter?

I have been doing shooting with a Rebel XSi for about 5 years now as a hobby, and want to step it up a bit. I am looking at getting a 7D, but I was advised to get the T4i instead. The main arguments ...
5
votes
3answers
1k views

Reducing chroma noise in Aperture

I have some photos shot in low light with a compact camera which exhibit significant chroma noise, which I’d like to correct as much as possible. My searches turned up a technique called “chroma ...
2
votes
2answers
253 views

Editing or retaking my shot to maximize sharpness, image quality, and reduction of noise.

This is my image that is part of a pano I'm working on. How can I transform it to be similar to this amazing image especially when considering sharpness, noise, and the the light coming form the ...
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 ...
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 ...
7
votes
4answers
562 views

Has low-light ISO performance really improved over the past 3-4 years?

I have a Canon 40D and I always shoot RAW. I am overall pleased with the 40D except for its low-light performance. Anything at or above ISO 800 is unusable for my taste. Just to solve this problem I ...
4
votes
1answer
864 views

How does in-camera noise reduction compare to software one?

Does programmatically reducing noise reduction the give the same results as hardware post processing in camera, such as on a Nikon D90? What is the best software to do such things (like Photomatix ...
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vote
2answers
107 views

What does “green background” means, when related to “vibration reduction” [closed]

I just read in [Wikipedia](http://en.wikipedia.org/wiki/List_of_Nikon_compatible_lenses_with_integrated_autofocus-motor Nikon VR/Sigma OS/Tamron VC/Tokina VCM: Optical image stabilization, also ...
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 ...
20
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 ...
8
votes
2answers
756 views

Why do my photos look like they're painted?

I'm not an expert, but all the photos I take look like they've been painted. It doesn't look like normal blur. I'm using a FinePix S2500HD and the following photo was taken at 1/2000 exposure. I ...
3
votes
4answers
273 views

What is a good amount of noise reduction to apply in post-processing?

This is similar to this question, but I think slightly different. When post-processing a photo, especially one taken at high ISO, how much noise reduction should be applied? I know this question ...
12
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 ...
2
votes
1answer
204 views

Factors for preventing noise in-camera

In low lighting conditions I have to bring up my ISO (even when using flash) and open the aperture to a certain point to get the ambient light alongside subjects I'm photographing (which are mostly ...
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. ...
20
votes
4answers
940 views

What is ETTR (Expose To The Right)?

Picking up from this answer and this question, What exactly is ETTR? How it may reduce the image noise? And how is it difference from film to digital sensors? In the answer linked above, what are the ...
1
vote
1answer
395 views

What noise reduction software will best work with images from my Kodak EasyShare Z981? [duplicate]

Possible Duplicate: Which noise reduction software has the best results? I have been at this for only a short time and I would like to consider myself a "photographer" yet, I must be ...
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 ...
7
votes
2answers
3k views

Can I get noise reduction in Aperture that even gets close to the quality of Lightroom's?

I've been looking for a new Library / Photo Editing software, iPhoto isn't really cutting it any more. I've been using both Aperture and Lightroom a bit now (trial licenses) and I noticed a big ...
8
votes
2answers
703 views

Where does the noise come from in a long exposure?

I created another test. This time I exposed for 36 minutes, because I wanted to test star photography. This is not meant to be a nice photo; I really just tested. Camera was inside the house behind ...
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 ...
5
votes
3answers
224 views

Will I miss any features of Lightroom 3 if I already have Adobe Photoshop Extended CS 5.5?

I am planning to upgrade my CS4 to CS5.5 (Design Premium) - I heard Lightroom 3 has new cool features such as new and improved noise-reduction in photos. Do you get pretty much all the features of ...
11
votes
3answers
1k 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 ...
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 ...
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 ...
0
votes
0answers
56 views

Different sources of noise and ways to avoid/correct those [duplicate]

Possible Duplicate: What types of noise can be present in digital photographs? I've few questions related to noise found in digital images. There are topics on this forum on underexposure ...
3
votes
4answers
701 views

How can I keep my camera cool on a budget?

Is there a way to cool the camera without buying a new hardware? How do you determine that the camera is NOT cool ATM? What temperature can be considered hot for the camera sensor? Does cooling really ...
1
vote
1answer
1k views

Should I use in-camera noise reduction, or is it better to leave that for desktop-based post-production? [duplicate]

Possible Duplicate: Is in-camera high-ISO noise reduction worthwhile? Should this be done using image processing software like Photoshop or the built in function of the camera ? It seems a ...
13
votes
1answer
1k views

Is in-camera high-ISO noise reduction worthwhile?

I shoot in RAW and post-process in Aperture where needed. Does the in-camera noise-reduction do anything that I can't do in Aperture or other post-processing software? It seems to add a bit of time ...
2
votes
3answers
493 views

Why is dark-frame subtraction on my Pentax camera shorter than the exposure time?

When my Pentax K-r applies long exposure noise reduction (dark-frame subtraction), the processing time required for this operation is less than the exposure time. For example, my camera may perform ...
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? ...
19
votes
10answers
1k views

How do I reduce noise, given that I have complete control over everything else?

I want to take some pictures of some crystals. Being crystals, they don't move around much so I can set up my camera and lighting as I like. I have a high-powered halogen light shining on them, and ...