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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
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0answers
92 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 ...
4
votes
1answer
201 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 ...
17
votes
2answers
797 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 ...
3
votes
2answers
125 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 ...
2
votes
3answers
295 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
143 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 ...
2
votes
2answers
265 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: ...
1
vote
2answers
359 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 ...
12
votes
2answers
412 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 ...
0
votes
4answers
110 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 ...
2
votes
4answers
190 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 ...
2
votes
1answer
284 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?
1
vote
2answers
259 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 ...
0
votes
1answer
118 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. ...
4
votes
2answers
301 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 ...
5
votes
4answers
320 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 ...
0
votes
0answers
336 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 ...
0
votes
4answers
1k 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
312 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
4answers
410 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
322 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 ...
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. ...
6
votes
4answers
1k 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 ...
7
votes
2answers
221 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
355 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
284 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
793 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
227 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 ...
6
votes
2answers
646 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 ...
11
votes
2answers
340 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 ...
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 ...
4
votes
2answers
216 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).
5
votes
3answers
825 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 ...
8
votes
2answers
762 views

Why do my photos look like they're painted?

I'm not an expert, but all the photos I take look like they've been painted. It doesn't look like normal blur. I'm using a FinePix S2500HD and the following photo was taken at 1/2000 exposure. I ...
3
votes
1answer
264 views

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

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 ...
6
votes
2answers
299 views

What causes a band-like pattern in photos of a CFL?

CFL Image The image in the above link is that of a compact fluorescent light bulb. I couldn't figure out the reason for the formation of light and dark bands sort of thing in the image. The same ...
2
votes
3answers
555 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 ...
7
votes
1answer
336 views

What causes the spots in my IR photos?

Below are images I've shot recently while experiminting with IR photography. The first is an IR image with +2 stops of exposure and a custom white balance based on the bright part of the tag on the ...
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.
4
votes
2answers
344 views

What is causing the cyan outline in the building in the background of this image?

I took this picture the other day. It's a JPEG from the Fujifilm X-Pro1. The sky is overexposed as was necessary to light Anya brightly — and because I was playing with shooting wide open, and that ...
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 ...
4
votes
2answers
366 views

How do I avoid white color in the sky near my subject with HDR photos?

I have created a HDR image from a single raw file. The way I have created it was Open the RAW file in Photoshop camera raw. Do some adjustments like enhancing the color, cropping etc. Exporting the ...
8
votes
4answers
880 views

How do I eliminate lens flare in my pictures?

I have taken a few pictures that show these circles, and I'm getting very annoyed at this problem. Seems most common on sunny days. This particular picture is not my own, but it is a good example of ...
9
votes
2answers
640 views

Why does the left windmill have too many blades?

Ok, check this shot out: These are the 3 windmills in Marshfield Massachusetts. It was shot from Provincetown, MA about 35 miles away. (I wasn't out to shoot them, I was shooting Right Whales... I ...
3
votes
2answers
660 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
332 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
201 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
6k 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
2k 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
405 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 ...