Shadowy Daisy

Shadowy Daisy
by damned-truths

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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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48
votes
4answers
55k 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"?
33
votes
7answers
4k 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?
29
votes
2answers
5k views

Taken a picture of my monitor while spinning in circles - why is it distorted?

I just found a picture again I took years ago, and I'm wondering what's happened ever since then - I hope this is the right place to ask! I sat on my swivel chair and spun a few times, while taking ...
26
votes
6answers
5k 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 ...
25
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 ...
18
votes
6answers
14k 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 ...
17
votes
2answers
1k 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 ...
15
votes
4answers
4k 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, ...
12
votes
7answers
7k 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
6answers
2k views

How can I avoid green flare on my sunrise photos?

I took a series of sunrise photos. Once the sun actually came above the horizon, the brighter the sun became the more apparent and brighter a green flare (glare?) appeared. How can I avoid that? ...
12
votes
4answers
7k 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 ...
12
votes
2answers
492 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 ...
12
votes
2answers
1k 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 ...
11
votes
3answers
779 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 ...
11
votes
2answers
399 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 ...
10
votes
1answer
2k 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. I'...
10
votes
4answers
1k 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 ...
10
votes
2answers
670 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 ...
9
votes
4answers
1k 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
4answers
750 views

How can I avoid circular banding artifacts in clear skies when de-noising?

I photograph in RAW, and convert using Darktable. Camera happens to be Nikon D40, 55-200mm lens. For a small number of photos, especially of clear blue skies, I cannot reduce noise without introducing ...
9
votes
2answers
1k 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 ...
8
votes
3answers
1k 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 ...
8
votes
4answers
4k 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 ...
8
votes
5answers
12k 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 location....
8
votes
2answers
693 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. ...
8
votes
3answers
918 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 ...
8
votes
1answer
800 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?
8
votes
2answers
207 views

Horizontal banding pattern near sun: sensor flare?

Following is a crop from a RAW shot, developed in Lightroom 5.7, into a setting sun from a Sony A77II – ISO 100, f/5, 1/20s, with a TTL fill flash. In the darker regions near the sun a series ...
7
votes
4answers
5k 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
4answers
570 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 ...
7
votes
2answers
283 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 ...
7
votes
1answer
710 views

What is the strange wide, bright line across this photograph?

I shot this image on a GoPro camera in time lapse mode. It was at ISO 100, f/3.6, 1/950sec. I also happened to be moving the camera at very high speed during the shot. What is the ligher horizonal bar ...
7
votes
5answers
906 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
2k 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: http://www.flickr.com/photos/...
6
votes
3answers
668 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 ...
6
votes
2answers
520 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 ...
6
votes
2answers
5k 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 ...
6
votes
2answers
495 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 ...
6
votes
1answer
549 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 ...
6
votes
2answers
312 views

What is the cause of this unusual concentric blob defect (taken in below zero conditions)?

My brother took a number of pictures in the alps recently, and a few of these showed defects similar but not identical to the one below. The temperature was -14 C which doesn't seem unreasonably cold....
5
votes
2answers
625 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 ...
5
votes
4answers
3k 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.
5
votes
1answer
359 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 ...
5
votes
3answers
401 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 http://i.stack.imgur.com/...
5
votes
4answers
472 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 ...
5
votes
3answers
478 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, ...
5
votes
1answer
312 views

Why am I am seeing rings (banding) instead of smooth graduation in my sunrise pictures?

Below is a screen capture crop from Potoshop of an unaltered raw photo from my full frame Canon 6D taken with the new Canon 16-35 f4 L at 16mm, ISO 100, f22. I am seeing rings where I am expecting a ...
5
votes
3answers
2k 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 doesn'...
5
votes
2answers
215 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 ...
5
votes
2answers
155 views

Time-varying artifacts in long exposure: is it the sensor?

I have just made my first attempt to photograph the International Space Station, and I clearly need to improve my technique. Here are the details: Body: Canon EOS-M (1) Lens: EF-M 55-200mm at 200m, ...