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Image perturbation caused by electronic transformation and processing.

learn more… | top users | synonyms

1
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0answers
47 views

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

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 ...
0
votes
0answers
43 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 ...
7
votes
1answer
179 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
161 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
103 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 ...
3
votes
1answer
79 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
2k 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 ...
94
votes
5answers
7k 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
120 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
331 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
0answers
111 views

Canon L Lens producing higher noise/grain? (24-70mm f2.8 II)

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, ...
0
votes
3answers
90 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
607 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 ...
1
vote
0answers
77 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?
24
votes
8answers
28k 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 ...
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 ...
3
votes
1answer
382 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 ...
0
votes
0answers
320 views

Why does an exported JPG image from RawTherapee have much more noise?

Please see the two images below. Any idea why the export output has more noise?
2
votes
2answers
245 views

Does it make sense to “Expose to the Right” except at base ISO?

I have read in a number of places that exposing to the right (ETTR) only makes sense at your camera's base ISO, with the justification being that if you are boosting the gain in camera (by raising the ...
8
votes
2answers
3k 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 ...
3
votes
3answers
484 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 ...
1
vote
2answers
2k 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 ...
0
votes
1answer
65 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.)
4
votes
4answers
614 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: ...
1
vote
0answers
240 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
1k 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
302 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 ...
23
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 ...
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 ...
1
vote
3answers
6k 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 ...
4
votes
3answers
619 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
681 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
375 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
349 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 ...
11
votes
2answers
4k 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 ...
9
votes
4answers
5k 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 ...
2
votes
2answers
437 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 ...
1
vote
2answers
410 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 ...
0
votes
2answers
124 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
428 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 ...
12
votes
9answers
8k 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 ...
6
votes
4answers
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
251 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
2k 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
4k 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
4answers
4k 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
714 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 ...