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Image perturbation caused by electronic transformation and processing.

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1
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3answers
100 views

How can I reduce digital noise while exporting from Lightroom?

I particularly shoot images during morning or evenings as those conditions are favourable for landscape in my region, but while retouching the raw files in lightroom, I came across tons of digital ...
9
votes
2answers
2k 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. I'...
0
votes
2answers
73 views

How much of digital sensor noise is thermal?

Is all digital sensor noise thermal? And what is the relationship between temperature and noise? For example, as we cooled a CMOS towards absolute zero, would we discover that high-ISO images would ...
3
votes
6answers
364 views

Can photos taken with high ISO be fixed?

Please see the the attach photos. Our wedding photographer shot all of our pictures in shutter priority mode and ISO 6400. They are grainy, poor . Is there ANY way to fix them?
0
votes
1answer
57 views

Is there a way to determine a camera's quantum efficiency?

I need to know my camera's quantum efficiency for a research project which involves the usage of a Nikon Coolpix A10. Is there some way to know it?
-1
votes
2answers
98 views

Why are my photos grainy now when they never used to be? Need help [closed]

All of a sudden my photos are grainy. Never happened before. Need help please. Thank you.
6
votes
6answers
291 views

Why are my sports team pictures fuzzy?

UPDATE: I added the largest jpeg files I could with the original tone, unedited except for a cropping and the change from RAW to jpeg. Thanks for everyone's advice!! This forum is awesome! I use a ...
2
votes
2answers
164 views

Are focus and noise problems I see with my Nikon D80 simply because newer cameras are better?

I can't seem to get photos with good focus or without noise. Is it the fault of the Nikon D80?I have read that cameras only two or three years old have much better light sensors and that that is what ...
1
vote
2answers
70 views

Does changing the WB in post-processing affect noise?

I have a friend who took some macro photos of snowflakes with the WB preset to "Cloudy", but lighted from an 11-watt flourescent bulb. Snowflakes look more pleasing with a blue tint, rather than "warm"...
1
vote
1answer
155 views

Will sun damage to a sensor create an unusual amount of noise in images?

Recently I was playing with my Sony α6000 camera, taking some shots of birds in the morning and also the sun. It was after taking the shots that I stumbled upon the fact on the internet that sun ...
3
votes
0answers
102 views

7D noise levels. Can it get worse with camera age?

I have been using my 7D for 4 years now and never really noticed luminance noise but a couple of recent batches off photos with low ISO and nice bright sunlight conditions are yielding more noise in ...
6
votes
3answers
3k 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 ...
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, ...
5
votes
2answers
201 views

Why does raising ISO make image quality appear lower even though my measurements suggest it shouldn't?

I know this may be rehashing one of the most discussed topics, but I would like to take it a slightly different direction and solicit input. First of all, I am familiar with the electrical ...
3
votes
3answers
1k views

Can I use a single RAW file with stacking to reduce noise?

Can I get the same results by copying a RAW (same exposure) file many times and stacking to reduce noise as I would if I used many separate exposures?
15
votes
4answers
3k views

Why is there the illusion of detail in photographic noise?

I have the following image which contains noisy mountains. In the lower part of the image, the signal-to-noise ratio is too low to contain actual details, but when I remove all the noise from this ...
2
votes
1answer
78 views

How can I measure noise from the photo?

With higher ISO comes "bigger" noise. Is there a way to measure how much noise does the photo have? Maybe some programs can calculate it?
0
votes
2answers
78 views

Why do exported image contain colored grains/noise when viewed in GNOME Image Viewer?

I was editing a JPG image taken by Nikon D5300, a mid-range DSLR. Original picture was somewhat washed out. After some color-correction, I exported the image both in JPG and PNG format. Original JPG:...
0
votes
2answers
114 views

Should I be worried about the pixelation in my photo? [closed]

I took a photo of a lake and while editing it I found that the image actually had sensors pixel view all over the picture. Is this something I should worry about? Here in my photo, Pixels of the ...
4
votes
5answers
718 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: ...
5
votes
4answers
6k 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 ...
2
votes
0answers
354 views

Why does my Canon 24-70mm L Lens appear to produce higher noise/grain than my 50mm f/1.4 in similar environments?

I just purchased a brand new 24-70mm f2.8 II for my upcoming trip. I've been testing out this lens for the past few days, and have noticed something that I'm a bit confused by. It seems by my tests, ...
1
vote
3answers
9k views

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

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 ...
3
votes
3answers
247 views

Why my shot in winter has noise as I have an ISO of 200?

The picture below has noise it was a cloudy day, but light was good. And ISO was set to 200. I couldn't find a good reason in my reflection process to know why noise has emerged and what to do in ...
1
vote
0answers
335 views

Is it normal for the Canon 6D to exhibit more color noise compared to a 50D?

My first day with 6D, upgraded from a 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 ...
2
votes
3answers
144 views

What causes noise floor in an image sensor?

In the book Image Sensors and Signal Processing for Digital Still Cameras, it says that Read noise, or noise floor, is defined as noise that comes from the readout electronics.Noise generated in a ...
8
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
0answers
47 views

Cant the eye see noise [duplicate]

Is the question I've been asking for a while. The reason why I am seeking an answer to this question is because I have Visual Snow http://www.visualsnow.eu/ and I had it since i was 8 and i can't help ...
9
votes
2answers
5k 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 ...
0
votes
1answer
95 views

There are many red and black spots in my photos,what are those? [duplicate]

I am using canon 60d for more than 1year.few months ago i suddenly saw these dots were appeared in my photos.i have tried manual sensor cleaning several number of times,but this didn't work for me....
1
vote
2answers
717 views

What are the red, blue, and green dots in my night sky photos? [duplicate]

I recently bought a new telephoto lens for my Nikon D5000. With the new lens I started taking pictures of the moon. When I take the pictures I have blue, red, and other colored dots in the photo, ...
1
vote
1answer
254 views

Why am I getting noise with D3200 even at ISO 200?

I just bought a Nikon D3200. My first DSLR. Am using a 50mm f1.8D Nikkor lens. Now, at ISO 200, I took a few test shots and though the images look fine on the small screen, as soon as I view them on ...
1
vote
2answers
1k views

Why do RAW images in Darktable have a lot of noise?

I installed the latest version of Darktable from the Ubuntu PPA from their homepage (1.6.8). When I import RAW ges from a folder they all seem to have a lot of noise. I opened the exact same images ...
1
vote
0answers
221 views

How can I avoid noise (white dots all over the picture) with GoPro Hero4's nightlapse mode? [closed]

I have been testing my GoPro Hero4 Black's Nightlapse mode to take night sky photos and i am getting a lot of noise (lots of white dots all over the picture). I'm using the Max 30 secs exposure time ...
1
vote
0answers
73 views

Easy prevention of unintended lines after crop in Photoshop cs6?

After cropping and saving for web as jpeg (maximum, optimized, convert to sRGB selected) there are unintended 1px gray lines around the border of my images that have a white background. I've read that ...
8
votes
1answer
354 views

How can an electronic shutter reduce dynamic range?

I read a recent review of a camera which can use either its mechanical shutter or an electronic shutter. The review mentions a problem they noticed with the mechanical shutter, and then notes that the ...
5
votes
2answers
165 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 ...
0
votes
1answer
207 views

What causes chroma noise in an image sensor

I'm trying to understand what is causing chroma noise in an image sensor, specifically why it is so visible when the ISO is set to a very high value (which for CMOS I guess means that there is an ...
4
votes
1answer
180 views

How do I compare camera signal-to-noise ratio based on camera sample images?

I want to choose a camera with the best signal-to-noise ratio within my budget. I want to ignore producer's marketing BS and reviewer's presumptions that "something's really cool". I know about ...
14
votes
1answer
3k 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 ...
108
votes
5answers
8k 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?
4
votes
2answers
266 views

Is analog gain really actually power-of-two only?

Context I'm using a Nikon D5200, which features extra ISO values between powers of two, that the Nikon D60 did not offer. D60 offers 100, 200, 400, 800, 1600 (1-stop interval). D5200 offers two ...
2
votes
4answers
2k views

Sony a7: Is there more noise for ISO <100?

I have a Sony a7 (original). And on the camera it has a feature my old Canon DSLRs never had: it allows me to select ISO values LOWER than 100. I understand the point of these lower ISO values: I ...
0
votes
3answers
113 views

Will using a DX lens on an FX Body compromise ISO performance? [duplicate]

In terms of ISO, is the ISO performance compromised? Say I was using a 50mm DX on my FX body, would I have a lower quality ISO performance vs an FX 50mm on my FX body?
0
votes
3answers
2k views

Do different lenses affect noise level?

I unfortunately got a very poor and cheap 18-55mm lens on my Canon 60D. In addition to poor quality of my photos (poor in comparison with my 50mm f/1.8 Lens which makes great pictures) the noise level ...
11
votes
3answers
2k views

How can I reduce noise at ISO 100 in photos taken in the twilight?

I shoot with a Canon EOS Rebel T5 and sometimes see noise even when shooting at ISO 100. Is this just because there is not enough light in the dark portions of the picture (seen below)? Is this a ...
2
votes
0answers
127 views

Yongnuo YN-468 II — how can I turn off the beeps?

I have a Yongnuo YN-468 II and the beeps while the flash is focusing are annoying. How do I turn them off?
28
votes
7answers
44k 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 scenario....
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"?
3
votes
1answer
1k views

Why do my photos appear grainy when taken at the widest aperture?

I have a Nikon d5000 and just purchased a Tokina 11-16 lens. I was taking picture of a dog 1-2 meters away during winter at mid day today. Using the aperture priority setting, I set the camera to ISO ...