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Tagged Questions

Image perturbation caused by electronic transformation and processing.

learn more… | top users | synonyms

3
votes
2answers
302 views

Why is there no image noise in my webcam dark frame photographs?

I'm trying to take some timelapse photos with a webcam. To reduce noise, I'm trying to take a dark frame. However, with the lens covered up totally, there is absolutely no noise in the image. The ...
0
votes
1answer
51 views

In what kinds of images would high noise be most manageable?

In what sort of photographs does the noise least detract from the image? (The noise is that resulting from use of high ISO settings.)
0
votes
2answers
54 views
1
vote
1answer
81 views

Output image of RawTherapee is different

I modified a raw image using rawtherapee which looks like below screenshot in editor. But when I export it (I have tried all options: jpeg,png, best quality etc), the output image is not same. It ...
1
vote
0answers
139 views

Canon 6d color noise (and compared to 50d)

my first day with 6D, upgraded form 50D. Wouldn't be pixel peeping but something unusual caught my eye when I opened photos in Lightroom this morning. The color noise pattern is completely different ...
0
votes
1answer
151 views

How to stop Nikon D3200 from shooting everything at ISO 3200 in Auto mode

When I use the Auto mode on my Nikon D3200, it will almost always shoot at ISO 3200, even if I have a potent external flash in place. Because of the quite small pixel size of the camera, it will make ...
1
vote
3answers
135 views

Too much “Grain” in photos [duplicate]

i'm trying to produce a few mockup pictures of a person using a tablet around the house. These are the conditions: Camera Nikon D90, Lens 18-55 The pictures were taken in the morning Indoors but the ...
16
votes
5answers
1k views

Might future advances in sensor technology reduce or eliminate noise?

Is there a possibility that future tech advances may reduce or eliminate the noise when using high ISO setting, or is this noise unavoidable and inherent to all digital sensors? If there is a ...
4
votes
3answers
300 views

Is the megapixel count setting on a P&S digital camera real or a gimmick? [duplicate]

Does downsizing the effective recording megapixel count setting on my P&S digital camera actually decrease the sensor-megapixel density, thereby increasing pixel size and culminating in better ...
-2
votes
5answers
313 views

What's a good software to combine all the frames in a video into a photo?

The goal is to reduce noise. This is on my iPhone 5s, which has bad low-light performance, as you can imagine. So I wanted to see if I could take a video (without the phone moving), and then merge ...
0
votes
6answers
255 views

Is the low-light advantage of larger sensors attributable to the sensor itself or to the larger aperture of the lenses? [closed]

Let's say I take a photo using an APS-C camera and using an FF camera, from the same position, with the same ISO and shutter speed. Let's say I use a 50mm focal length for the FF camera. To match the ...
2
votes
3answers
189 views

Can I get better results from my Panasonic Lumix DMC SZ1 in low light?

I made a very quick decision buying this camera. I was amazed due to its 10x zoom and its amazing image stabilizer. And of course, by its low price. But after getting it delivered and using it in ...
10
votes
2answers
2k views

What is sharpness vs. clarity in photo editing software?

I have been using Lightroom and Photoshop Pro for past 7 months. For all my photos, I used to increase the sharpness using the options available. I now see another option called clarity, and when I ...
1
vote
2answers
371 views

Sony A7R Noise compared to Nikon D800/E Sample Explanation

I am looking for a high resolution camera for fine art prints and the Sony A7R seems great since it has the same Sensor res as the D800 in a smaller enclosure. For some reason when I look at sample ...
0
votes
2answers
111 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 ...
13
votes
1answer
679 views

Is it really better to shoot at full-stop ISOs?

The second half of this answer says Notice that I only shot full-stop ISO which is important with Canon DSLRs because the gain to obtain the 1/3 stops in between is applied in software by the ...
4
votes
5answers
395 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 ...
1
vote
3answers
3k views

What is the highest acceptable ISO to use for weddings with Canon 7D?

I recently had my first wedding shoot(yippie!). For a person like me who usually shoot still life and landscape, weddings is a whole new world. I am used to shooting at low ISO's (800 or less) but the ...
1
vote
2answers
269 views

Can a circular polarizer filter cause noisy images?

I am using a Canon 450D with 17-85mm Canon lens. I noticed that the image is very noisy when I use my CPL filter. Is my filter bad quality or is this normal? I notice this especially when I take RAW ...
1
vote
3answers
216 views

Can we always talk about noise difference between crop and full frame?

Let's say we have two systems: 1) full-frame camera, 80 mm lens at f/2.2 2) APS-C camera, 50 mm lens at f/1.4 The subject is the same, as well as the camera position, focus distance, shutter speed ...
2
votes
3answers
997 views

Continuous Bursts of Many Short Exposures vs. A Few Long Exposures for Astrophotography?

When reading many sources that address doing astrophotography, I often see the advice to take multiple exposures and stack them rather than one long exposure. Often the reason given is that the longer ...
5
votes
4answers
2k views

What ISO should I use on my Nikon D5200 to avoid visible noise in 4×6 prints?

I recently bought a Nikon D5200. For several of the photos taken the ISO setting I have used has been high — in the range of 1000 to 4000 (most of them were in poor light, without flash and in manual ...
1
vote
2answers
466 views

Why are my pictures noisy when zoomed at 1:1 in Lightroom 4?

I am shooting with Nikon D7000 and 18-105mm lens and RAW only not (RAW+JPEG). When I import my pics in Lightroom 4 and zoom it at 1:1 both in Library and develop modules I see a lot of noise, though ...
3
votes
1answer
385 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 ...
0
votes
2answers
196 views

What factors, asides from temperature, affect dark current?

What is an effective means of determining the average dark current/noise of a camera image sensor? My understanding is that this is type of noise is temperature dependent, what other factors may ...
19
votes
1answer
571 views

Is it true that shooting in live view mode adds noise to the picture?

I heard from some experienced photographers that shooting in live view mode creates additional noise compared to shooting through the view finder under the same conditions. I assume that while using ...
7
votes
3answers
696 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 ...
3
votes
4answers
1k 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 ...
18
votes
9answers
16k 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
284 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
279 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
242 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
121 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
281 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 ...
3
votes
7answers
3k 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, ...
17
votes
5answers
4k 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
334 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
282 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
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 ...
4
votes
1answer
641 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
3answers
2k 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 ...
2
votes
1answer
208 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 ...
7
votes
2answers
2k 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
632 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
409 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 ...
4
votes
2answers
138 views

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

What is physical nature of noise in small-sensor cameras? Is is thermal noise in the semiconductor? Is there hope that in couple of years, noise in small sensors will disappear, and small sensors ...
1
vote
1answer
198 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
286 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
342 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 ...