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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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7
votes
3answers
895 views

What causes these green dots in my image?

I just received a 35mm f/1.8 DX lens for my Nikon D50 for Christmas, and took some shots where the lights on the tree were the main source of illumination. Almost all of them exhibit very prominent ...
1
vote
1answer
412 views

What is causing the bright flare on all of my images?

My new camera Canon 6D show this lensflare (raw or jpeg) in all the photos with this lens (Canon 50mm 1.8) or with the Samyang 16mm 2.8 (which I returned for judging what was defective). The lensflare ...
0
votes
1answer
116 views

How to remove unwanted colors in picture? [duplicate]

I took product photos for my company and am currently editing them. However, some of the white parts of the shirt look a little odd zoomed out. When I zoom in, I see the following: I'd like to ...
1
vote
1answer
123 views

Why are there white outlines around the subject in this photo when zoomed in?

Please give me a solution to this if possible. Image showing white outlines when zoomed. Crop: Zoomed:
0
votes
2answers
73 views

Can a ghostlike image be caused by a overlap with previous frame on an SD card?

Is it possible for a secure digital card to have a ghostlike image on a different frame, ff you shoot digital cards and do not reformat them? Could a ghost image appear from a previous frame number if ...
6
votes
2answers
425 views

Why does this satellite image of an airplane in motion show red, green, and blue bands with strange artifacts?

I stumbled upon this satellite image (http://goo.gl/Wv503u) capturing a plane in flight over a city. I'm having a little trouble explaining the color effects caused by the aircraft motion. What I ...
26
votes
6answers
4k views

Why do photos of digital screens turn out the way they do? [duplicate]

When I take pictures of a screen at school or at my house, they turn out really weirdly. When blown up to 100%, they look fine, but when they get sized down, they look really weird, here is a ...
3
votes
1answer
304 views

Is there a name for artifacts for taking a photo of LCD / LED screens and how to remove or avoid it? [duplicate]

The following is a photo of a game console 3DS, although the 3D is turned off: There is "fish nest" artifacts, and sometimes the lines even curve on some photos. iPhotos on a Mac seems to try to ...
1
vote
3answers
98 views

What could have caused this splotch to appear?

amature photographer here. I recently took some photos of the area nearby where I am staying, and one of them caught my attention when going through them afterwards: Notice that gray splotch at the ...
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 ...
3
votes
0answers
107 views

Why is there a grid pattern of darker pixels in this twilight sky flat field? [closed]

This is the first time that I'm really inspecting the calibration images we were taught to take/use during data reduction, and I've noticed something in all the flat fields. The image below clearly ...
3
votes
2answers
1k views

What causes longitudinal chromatic aberration on Nikon 50mm f/1.4D?

I have looked on my new 50mm lens photo (I have Nikon D90) and I see "purple fringing" around the unfocused objects (longitudinal chromatic aberration). What's is going on? Is it common for this lens ...
3
votes
2answers
137 views

Are these weirdly-shaped purple stains really from particles under the first layer of the sensor, and if so, what can I do about it?

I have those little particles on my pictures. There are a lot of them, as you can see, and they have different weird shapes: I already sent my camera for a sensor cleaning and the guys at the shop ...
17
votes
2answers
833 views

Why do I see this yellow color shift at high ISOs and fast shutter speeds? [duplicate]

I recently purchased a full-frame DSLR with a reported highest ISO of 204,800. I’m intrigued by the possibilities of the high ISO range and how far Lightroom and Aperture (I use each of them) can ...
2
votes
3answers
431 views

What is the blue circle in this moon image?

Using my Nikon D3200, I tried to capture an photo of the moon using the 18-55mm kit lens. I can see a faint blueish circle, even in my view finder, and also in the final picture. Is this lens flare ...
3
votes
1answer
161 views

Why is the center of image smudged with magenta/white at a small aperture?

I took two pictures with a Nikon D300 and a 17-55mm f/2.8G lens. Both pictures have been taken at ISO 200, aperture f/22 and shutter speed 1/8s. I used a tripod. The only difference between the two ...
0
votes
0answers
408 views

Why do some of my RAW files get “broken”, with narrow solid black horizontal lines?

I shot a lot of photos during my summer vacation. Traveling during daytime, with little time to edit or review photos I often copied and erased my memory cards at nights so I could be ready for next ...
2
votes
1answer
390 views

What is causing this one line on all my photos from Nikon D3100?

Whenever I take a picture with my dslr, there is a strange line that shows up on the left of the picture all the time. Can this be fixed my myself, or do I have to send this one in?
2
votes
2answers
317 views

What is causing the strange lighter circles in images taken with my Canon 15-85?

I took these pictures with my Canon EF-S 15-85mm f/3.5-5.6 IS USM lens this morning: Would somebody please tell me that what is that white part in the lower right corner of the picture? EXIF info: ...
8
votes
1answer
1k views

is it normal to get significant lens flare with a 50mm f/1.8 Canon prime lens?

I've purchased a Canon EF 50mm f/1.8 II. But I'm really disappointed in the results, especially when using it for night photography. :( In my night shots a lot of lens flare appears in my photos. ...
12
votes
2answers
525 views

What causes and how can I avoid this moiré pattern in a composite night sky photograph?

I'm new to taking star trails, and fairly new to photography in general. After my first attempt at taking a star trail, I composited them in Photoshop and when I merged the layers I got this pattern ...
1
vote
2answers
385 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 ...
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"?
0
votes
4answers
115 views

Dark spots - sensor toast?

I can't seem to get rid of some very annoying dark spots that are very noticeable under certain lighting conditions. I've taken a test shot of my monitor showing a white background and amped up the ...
0
votes
1answer
130 views

What's causing the weird light pink color splotch in this photo?

Can someone tell me what is causing the splotch in this photo? It;s like a pinkish color right in the middle. The day was cloudy. Sun wasn't out. This is only seen in two of the pictures that I have. ...
2
votes
4answers
226 views

Are these strange splotches on buildings in a long-exposure photo hot pixels?

This is the first time I've seen this in my pictures and can't quite figure out what it is / how it fix it / or how to avoid it in the future. Was wondering if anyone here had any ideas? The thing in ...
1
vote
2answers
377 views

What's causing the “seeing double” lens ghosting in my photos?

I'm having a problem with my lens (Sigma 70-300mm f/4-5.6 APO) and this is what is happening sometimes: You can see the ghosts happen only by those red lines I've drawn, for example that metal ...
5
votes
4answers
344 views

What is the cause for this diffused artifact around the sun?

Last weekend, I tried shooting a wide-angle shot of a sunrise on the beach: You'll notice that there is a haze/artifact around the sun in an otherwise cloudless sky. What causes this? How can I ...
4
votes
2answers
322 views

What causes the dark halo around the copper part of the object in this photo?

I'm completely new to photography, and was attempting to shoot on a reflective surface (using a tablet for experimentation). I get some good results (to my untrained eye) but on my latest attempt, I ...
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 ...
5
votes
3answers
407 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, ...
0
votes
4answers
2k views

How to remove white spots from a scanned picture?

I have a photo and I scanned it, but the scanned version introduced a lot of white spots on the image. I think the problem is the type of paper of the photo, which is not smooth a bit rough. There's ...
12
votes
2answers
339 views

What causes faint circles in astrophotography images?

When processing an astro-images taken with a Canon 450D and prime focus, I often end up with a series of faint circles radiating outwards from an off centre point. What are they and how do I get rid ...
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
4answers
470 views

Where does the strange purple/blue glow around the headlight wearing subject's front come from?

I've found that a few of my recent trip photos have this odd artifact/ghosting resulting in a blue/purple glow around the helmet(see below pic): I've found this question which i think relates to ...
4
votes
2answers
353 views

Small, faint circle in corner of image. What is it?

I've started to notice a faint darkened circle in my photos. I tried to clean the lenses and I still see it. What's causing these circles? Link to imgur album since I don't have enough rep to post ...
4
votes
2answers
218 views

How to avoid fringes? [duplicate]

What can I do avoid fringes around a subject in my pictures? My camera is a bridge camera (namely a fujifilm hsr20).
6
votes
4answers
2k views

Why do my photos show blocky gradients, even in RAW?

I am learning to use my new DSLR, a Sony a57 with 18-55mm kit lens. I was shooting last night at sundown, and after exporting the RAW images to Lightroom, was surprised to see the gradient as showing ...
5
votes
2answers
3k views

Why does darkening skies in Photoshop cause banding, and how can I avoid it?

I am pretty new to Photoshop (I have Elements 10). When I darken highlights I find that the sky ends up in bands. I have read advice that says to reduce the effect of this by using either blur or ...
5
votes
3answers
2k views

Why are there white dots on my night time photo?

Could you please explain why I am getting white semi-transparent dots for night photography with flash on? Original image here.
2
votes
3answers
602 views

What could cause pink spots on my RAW photos?

I have only started shooting in RAW and have noticed pink spots on them. They are never in the same location and don't affect some photos, they just seem to appear every few shots. It never happened ...
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 ...
7
votes
2answers
230 views

What does it mean to excite aliases?

I recently came across the phrase 'excited aliases.' The phrase seems to be related to lens sharpness in some way. While a web search turns up the phrase a few times, I am unable to locate a decent ...
0
votes
1answer
475 views

How do I remove halos around a replaced sky in a black and white photo?

I am looking for a bit of advice from some Photoshop experts out there. I have a photo in which I have replaced the original dull sky (method explained below) with a sky that is a deeper blue and has ...
5
votes
1answer
295 views

What is this pattern artifact in a Hasselblad H4D picture?

Shot some shoots with Hasselblad H4D-50 and in (at least) one of them the following artifact(s) appeared: Of course some questions arise: What is this? (moire?) Why it happened? (aside of lack ...
3
votes
2answers
871 views

Why is there glow around lights in every photo shot with my Canon EF 28-70mm f/2.8 L USM Lens?

One day after using my Canon EF 28-70mm f/2.8 L USM Lens, I noticed that every photo has a huge amount of glow in the dark areas near any light area. I tested my other four lenses to figure out if ...
3
votes
1answer
254 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 ...
11
votes
2answers
350 views

What's the reason for this exceedingly blue reflection from buildings in this image?

I've noticed that lately my camera has some issues with blue neon lights. Here's an example shot. You can notice the effect in the reflection of the water in a building and in the blue dome of ...
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 ...
5
votes
3answers
972 views

White spots on some photos

I'm fairly new here and fairly new to photography too. So I'm hoping someone can help me out here. You see, there is this white spot that appears in my photos and I don't know what causes it. It ...