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Image perturbation caused by electronic transformation and processing.

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3
votes
4answers
2k views

Does micro 4/3 have an advantage in low light due to aperture equivilence?

Recent Micro Four/Thirds sensors seem to have improved their noise performance significantly. I own a Canon 5D Mark 2 full frame DSLR and am considering purchasing an Olympus OM-D EM5 micro four ...
27
votes
7answers
37k views

Is it better to shoot with a higher ISO, or use lower ISO and raise the exposure in post-processing?

Suppose there are two photos taken in the following scenario: Scenario 1 - Photo taken using ISO of 3200. Scenario 2 - Photo taken using ISO of 100. Both photos are taken in a medium light ...
2
votes
2answers
415 views

Does shooting at lower MP result in less image noise? [duplicate]

My Sony a65 has a 24MP and 10MP mode. Will shooting at 10MP result in less image noise? I'm looking to do more night photography.
9
votes
1answer
356 views

Why doesn't noise depend on exposure time?

In the post Why do cameras use a single exposure rather than integrating across many very quick reads? an important question was if the noise depends on the exposure time or not. By noise I mean the ...
3
votes
1answer
338 views

RAW export in Aperture giving square “grid” pattern over noise

I have a RAW photo in aperture that has quite a lot of noise. When I export the photo to JPEG (and TIFF/PSD, 16 bit) I get a strange square grid like pattern on the photo. Here is an example of the ...
2
votes
2answers
137 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 ...
5
votes
2answers
344 views

Why photos taken with flash appear to have less noise?

I have not verified this on pixel-peeping level. But I have observed that photos taken with flash (built-in one in my case) appear to have very less noise at ISO 800/1600 than the ones taken without ...
6
votes
7answers
5k 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, ...
18
votes
5answers
6k views

What is so special about ISO 1600?

I have heard many times that to minimize noise, the highest ISO you want to use is ISO 1600, and that no matter what camera or sensor you use, once you have passed this (ISO 1600) threshold, the noise ...
5
votes
1answer
426 views

How can a newer camera increase ISO while decreasing pixel size?

I am a bit confused as I am considering to upgrade my canon 350D to 600D. The pixel size has reduced from 6.4 microns to 4.3 microns, however, top ISO has increased from 1600 to 6400. How did that ...
5
votes
1answer
337 views

When is high ISO noise not noticeable?

I noticed that sometimes when taking pictures with my D5100, they come out with very little visible noise with ISO 800 and up, for example this picture. It was taken at ISO 1600 if I remember ...
9
votes
4answers
6k 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 ...
4
votes
1answer
1k 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, ...
9
votes
3answers
1k 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 ...
2
votes
2answers
4k views

Noise Issue / Canon 5D Mark II [closed]

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 ...
2
votes
1answer
222 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 ...
9
votes
2answers
4k views

Does the human eye experience noise as a camera would?

I've noticed when I am in very low light (light that isn't in the same room I'm sitting in), when my eyes adapt to the dark that I see colored particles. Do these colored particles resemble noise in ...
4
votes
2answers
846 views

Why does Nikon warn about banding at high ISOs when using autofocus on Nikon D4 or D800?

Nikon says that banding may occur at high ISO sensitivities with autofocus on the D4 or D800: D800 Noise in the form of horizontal lines may appear in pictures taken with AF-S Zoom Nikkor 24-85 ...
5
votes
4answers
451 views

How do I properly determine which camera is better in low light?

This question is motivated by the fact that I'm trying to decide between the the Canon 5D Mark III and the Nikon D800. I really would prefer the one that will perform better in low light. As far as I ...
5
votes
2answers
164 views

What is the nature of noise in small-sensor cameras, and can it be overcome in the future?

What is the physical nature of noise in small-sensor cameras? Is it thermal noise in the semiconductor? Is there hope that in a couple of years, noise in small sensors will disappear, and small ...
1
vote
1answer
234 views

What does shot noise in color images look like?

I can find examples of shot noise in monochrome images, but I can't find any examples in color images. What does shot noise in color images look like?
0
votes
1answer
312 views

How to minimise the noise when shooting primarily under candle lights?

The following shots are with a small white light throwing "emergency light" on a height of one and a half forearms. I used 3 candles on left side and 1 candle on the right. Used 3 candles on right ...
4
votes
2answers
521 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 ...
2
votes
3answers
212 views

Does size reduction in a fine quality JPEG photograph introduce noise?

Does size reduction in a fine quality JPEG photograph introduces noise? I use Gwenview to reduce the size of the JPEG photographs. Does that cause some noise introduction?
1
vote
1answer
588 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 ...
1
vote
4answers
237 views

How do I reduce the noise in this image / prevent noise in future images?

I'm Canon Powershot A510. I took photography as an elective, and I normally look for pictures later in the evening, as I find it more enjoyable to walk then. The problem is that - especially ...
4
votes
4answers
1k 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 ...
3
votes
3answers
443 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 ...
9
votes
2answers
1k 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 ...
-1
votes
4answers
257 views

Which factors are responsible for making a photograph zero noised when scaled to 100%?

While purchasing a DSLR which factors should be kept in mind if your aim is to zoom your photograph to 100%, frame it, and hang it on a wall? At 100% there shouldn't be ANY noise.
1
vote
2answers
3k views

What is the source of excessive noise in images from my D7000?

I'm a beginning photographer who recently invested in the following setup: Nikon D7000 camera body, 15-105mm Nikor kit lens, 150-500mm Sigma lens. We recently made a trip to the Pantanal, Brazil ...
11
votes
3answers
3k 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 ...
12
votes
9answers
9k views

Why aren't my night shots sharp even when I shot at ISO 100 on a tripod?

I recently purchased a tripod because I really want to do some night photography. I have tried practicing with street lamps, moon shots etc with my Canon 550D and 70-200 f/4L and most of them are shot ...
7
votes
5answers
2k views

How can I tell if two pictures were taken with the same camera without metadata?

Is it possible to identify images (without exif data) and link them to the exact same camera? If so, I'd like some software recommendations to get the job done. I have two photos that I'd like to ...
1
vote
3answers
543 views

Why is my RAW import not displaying properly?

I normally take my shots in RAW and normally work happily with them in Gimp on Linux. I have recently moved to a new shiny Windows laptop with Photoshop. I have imported some shoots using Lightroom 3 ...
4
votes
4answers
2k views

What is causing increased noise in my recent photos?

In the last two shoots I've taken I have noticed much more noise in the resulting photos. In the first instance, I put this down to my fault, as I was shooting at high ISO levels, but in the second ...
0
votes
0answers
59 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 ...
0
votes
2answers
993 views

When shooting HDR, is it better to use RAW images or jpgs? [duplicate]

Possible Duplicate: Should I convert RAW to jpeg before making an HDR? I just recently started shooting HDR images, and I like the effect when it's done right. I was just wondering, when I ...
3
votes
4answers
1k 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 ...
3
votes
3answers
3k views

This doesn't seem very sharp…is this normal?

Body: T2i Lens: Kit, 18-55mm f3.5-5.6 I went to shoot a sunrise this morning at the beach and got some great pictures, but when I uploaded them to some light post-processing, I was slightly surprised ...
4
votes
4answers
664 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: ...
6
votes
3answers
2k views

Is it me or is the Lightroom's zoomed out preview inaccurate in displaying noise and color?

I'm having some trouble with the Lightroom viewer (In develop mode) when zoomed out. Look at this picture: See how the sky seems to have a lot of chroma noise Now check the zoomed in version (Of ...
2
votes
2answers
5k views

Why is there so much noise in RAW files from my new Canon 7D?

I recently bought a Canon 7D, upgrading from a 50D. I was blown away by what I saw on the back of the camera after I took a few shots. Now that i've taken the time to import the photos into ...
1
vote
1answer
677 views

How to shoot good night photos with Nikon S8000?

Some time ago, I bought a Nikon Coolpix S8000, with big satisfaction for daylight shoots, but in using it I realized that my night shoots were more frequent than I expected. I tried to use it by ...
6
votes
2answers
665 views

What is the source of this multicolored noise in these samples?

I shot many long exposure photos (from 5 minutes to 30 minutes) back in December of 2010 with a two month-old Nikon D7000 and Tokina 11-16mm f/2.8 lens. The photos I took had very little noise. I ...
2
votes
1answer
202 views

Do cameras turn off their sensors when entering the menu?

Let me clarify this: In movie mode (or live view), the sensor is gathering light all the time, and due to this the heat starts to build up. This is a problem in certain situations, due to the heat ...
7
votes
5answers
2k 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"?
24
votes
2answers
2k 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
749 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 ...
8
votes
2answers
1k 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. ...