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Elements of a photograph that are generally undesirable or have a negative impact. Examples include noise, flare, dead or hot pixels, sensor "spots", reflections inside the camera/lens system, etc.

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3
votes
2answers
738 views

Why does my photo look great in Lightroom but show sharpening halos on my web site?

I haven't over sharpened my photo — it looks great in Lightroom and Photoshop CS5, but when I upload it to my webpage, it has horrible ghosts/halos around much of the subjects. I have tried it with ...
6
votes
1answer
358 views

Is camera damage causing these severe diagonal lines from concentrated light sources?

Since a week or so, I have severe diagonal stripes around light-sources in my night-time photographs on my Canon Powershot A650. In the past, I had some (I guess due to Fraunhofer diffraction, see ...
3
votes
2answers
202 views

Where do these “redshifts” and “blueshifts” come from?

I make many product photos for the company I work for. For this I use Canon 400D with two external flash devices Walimex CY-600K. I've noticed an interesting effect on many of the photos I take with ...
17
votes
6answers
7k views

What are jpeg artifacts and what can be done about them?

I know JPEG is a "lossy" compression algorithm that discards information in order to save space. What is the visual impact of this? I've heard of "JPEG artifacts". What do these look like? Are there ...
0
votes
3answers
3k views

What is the cause of these round spots on my photograph? [duplicate]

Possible Duplicate: Dust-like speck visible every few pictures — is it dust, or worse? Is this a finger print on the lens? I don't know. What can be the cause of the round spot on this ...
1
vote
2answers
417 views

What causes strange spiral pattern on my star line?

Ok, so I created this test image. The camera was behind the window, I just tested long exposure photography on the single star I saw. It was about 20 minutes of expo, star was out of focus (I really ...
1
vote
1answer
1k views

What is causing this white spot in every photo with my D90?

Recently I noticed that the photographs from my D90 has an odd white dot in it. The dot is present in every image. The dot becomes clearly visible as I zoom into the image. I have attached a photo ...
4
votes
2answers
402 views

Is it normal for the Canon kit lens to exhibit lens flare even without a UV filter?

I recently bought a Canon 550D and have been experimenting with this for a week. I have been pretty satisfied with the quality, until I faced this lens flare problem. Notice the unwanted blue light ...
8
votes
2answers
513 views

Why do I get horizontal grey bar with flash at shutter speeds slower than max sync speed?

I'm a total newbie to flash photography, and I am just trying to do some test shooting with Canon Speedlite 580 EXII using my 7D. I saw on the user manual that the maximum sync speed is 1/250 sec. ...
3
votes
2answers
411 views

Are these ghost light spots and vertical grain indication that my scratched polarizer is ruined?

Earlier, I unfortunately dropped my polarizer. There doesn't seem to be any damage save for a light scratch which I've uncovered only after a very thorough inspection. Nonetheless, I'm worried that ...
3
votes
1answer
345 views

Why does flare appear in photographs of sun or fire?

What is the new color that forms in the image when photographing a sun or similar things (see attachment with a rose glare)? Why and how it forms? Is it good for a image? How to increase or ...
3
votes
0answers
343 views

Why do I have a red dot in every photo? [duplicate]

Possible Duplicate: Why is my camera showing a lot of stuck red and white pixels? Every picture that I took today have a red dot on the same place in every photo. It looks like a monitor ...
4
votes
1answer
345 views

What is causing strange horizontal “flare” on all my photos regardless of lens and/or POV?

Suddenly on (almost) all photos I have a strange light band in the middle, regardless of lens and or angle on which I shoot the photos. The camera is an old Canon 1Ds Mk II and AFIAS the line of light ...
4
votes
4answers
982 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 ...
8
votes
4answers
3k views

Why are those green spots on my photo?

Took a pic with my 35mm Nikon lens last night, and got this light artifact. Is this something normal? Reflection? Is it dirt on my lens? How do I prevent this from happening? I think it only happened ...
5
votes
3answers
408 views

What creates this strange flare and how to prevent it?

I shot at a concert for the first time. The pictures were pretty good for the capability of my equipment, but on some shots, the light has a very strange flare. It isn't the usual rays, but some soft, ...
8
votes
5answers
7k views

Why is my camera showing a lot of stuck red and white pixels?

After shooting for one hour with my Rebelt2i + Tamron 17-55 f2.8, I went back home and checked pictures on my computer. For every single picture, there are a lot of 'dead' pixels at the same ...
4
votes
1answer
462 views

How to prevent weird spots and stripes on photos of window glass?

A few days ago I took photos of a nice curvy business center in another city. Later I discovered that many frames had weird artifacts on the glass, shown below as 100% crops. An almost normal shot: ...
2
votes
1answer
324 views

Why is there a subtle shadow glow around the subject with large aperture?

I've noticed that in a number of photos I've taken with a small depth of field due to wide aperture and a fairly close subject, I get a rather pleasing but not entirely explicable diffuse shadow ...
2
votes
1answer
340 views

Why might my camera show spots in video mode?

I own a Canon Rebel T1i, and when I try to record video, there are two dark spots on the screen. These do not appear when I take photos. Video (spots in center and right center): Photo: Does ...
5
votes
3answers
331 views

What are the cross patterns in this image?

On the bottom left area of this image, we can see a very prominent pattern of straight lines in two directions crossing each other Full version of the pic is available at ...
22
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 ...
44
votes
4answers
39k views

What is moiré? How can we avoid it?

What is the image defect called "moiré"? What causes it, and how can we avoid or reduce it? Is it related to "false color"?
10
votes
4answers
732 views

Where does this reflection come from in a long exposure shot?

Using a long (10 second) exposure I found I was getting an odd "reflection" in the picture, where the brightest object leaves a residue in the opposite part of the frame. You can see it here: I ...
7
votes
1answer
545 views

Dust-like speck visible every few pictures — is it dust, or worse?

I seem to have to dust-like speck on my Sony Cybershot S950's lens, but it appears randomly every few pictures. Could something be going bad internally?
6
votes
3answers
549 views

How do I get rid of these different spots after sensor cleaning?

I've just cleaned sensor on my Nikon D40x for the first time using sensor swabs and Eclipse solution. Here is a picture taken before cleaning and after . Dark spots on the first photo do not appear ...
7
votes
5answers
715 views

Are these blotches of wrong color caused by a corrupt SD card?

My old camera was taking images that had blotches of the wrong colors when zoomed in, and I take a lot of macro pictures. I bought a new camera and put my old sd card into it and now it's doing the ...
6
votes
2answers
1k views

How to control “starbursts” around light sources?

How can you control the size of "starbursts" from light sources in photographs? For example, the lights on the shore in this photo have very sharp and long starbusts: ...
3
votes
2answers
639 views

Why is my Pentax K-x producing artifacts and color banding?

my Pentax K-x is acting up :( In low light scenarios I got heavy color banding and 'strange' image artifacts. You can find an example here: http://imgur.com/v0lzP I took it at ISO 400 and the color ...
12
votes
7answers
5k views

Why does using flash sometimes create these white spots in the photo?

I have an Olympus FE-190. When I take a picture, with flash on Digital Image Stabilizer (DIS) mode, I get white spots in pictures. This doesn't happen always. There is only an option called Pixel ...
12
votes
4answers
4k views

How to avoid jpeg compression artefacts when saving photos in web resolution?

When I save a web-resolution image (for example, 1920×1024px), flat areas tints often have damaged shades of color. I'm saving in Photoshop CS4 with quality 2 in standard mode, because I need the ...
11
votes
3answers
672 views

Why are red lights in night / city scenes coming out as big red blobs?

I've noticed that in a lot of my night shots of cityscapes, red lights (e.g. neon signs on buildings, etc.) tend to come out as big red blobs: The above was taken with my Canon 500D. What can I do ...
13
votes
4answers
2k views

How can I avoid soft dull “spots” in my pictures?

Recently, I've been doing a lot more photography, particularly with my 100-400mm telephoto and 16-35mm wide. I am skilled enough that I can capture the shot mostly as I want with just the camera gear, ...
29
votes
7answers
3k views

How can I stop my HDR shots looking so fake?

All my attempts at HDR come out looking remarkably fake, how can I reduce the halos effect?