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Image quality describes how well a photograph matches a perceived technical ideal.

learn more… | top users | synonyms (1)

1
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2answers
551 views

How can I improve the sharpness of my pictures? [duplicate]

Possible Duplicate: How I could take crisp sharp shots without expensive lens? I have software to correct sharpness, the one I use the most in Linux is darktable. But post-processing never ...
10
votes
6answers
610 views

What can I do to improve my composition on rejected food photos?

I have been working on improving my food photography skills to raise the overall look of my blog. I am shooting with a Sony A100 often a 50mm in natural light. I think I am doing pretty well so far ...
9
votes
4answers
608 views

What is the meaning of these Photodune reasons for rejection?

I wanted some advice, I am new to photography, I posted an image on Photodune for sale and it was rejected because of: Element or framing composition Noise, exposure, lighting or saturation ...
2
votes
1answer
409 views

Image being corrupted in DSLR [duplicate]

Possible Duplicate: Why do my images get distorted on my Nikon DSLR? I have been shooting with my D90 for quite sometime and I have just encountered the following problem. What could have ...
2
votes
1answer
8k views

Image Quality of Canon 18-135 IS compared to 28-135 IS USM?

I have the Canon 28-135 IS USM lens and I am pondering replacing it with the newer 18-135. I know I'll be giving up the USM and FTM focus and gaining 10mm on the wide end (replacing my old kit ...
16
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6answers
5k 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
1answer
384 views

How does the megapixel-count and the aperture size affect the quality of the image from a given lens?

I have read that some lenses don't "support" high resolutions, so, for example, for some lenses (e.g. Nikkor 16-85 VR ), it's better to shoot at 9MP, instead of shooting at 16MP. Is this the case ...
1
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1answer
403 views

Export options for printing with Aperture 3

I am about to get my pictures published in a magazine. I am going send the pictures to the publisher, thus not printing them myself. Therefore I am curious about how to export the pictures ...
16
votes
1answer
710 views

Will I lose image quality by adjusting white balance in post processing?

I understand that if I shoot in RAW, post processing software like Lightroom is capable of adjusting colour temperature and tint to my desire. Will I lose any image quality in process? Or is it as ...
3
votes
2answers
1k views

If I'm happy with the speed, do I really need a faster class 10 or 30MB/s card for my DSLR?

My camera came with 4GB class 10, 30 MB/sec card. I wanted to upgrade to high capacity memory card but I was skeptical, a lower speed card such as class 10, 20MB/sec will cripple my camera when I use ...
4
votes
1answer
743 views

Why does my Finepix S2950 not show the image quality I expect?

I am a little confused as to why my Finepix S2950 takes photos like it does. I seem to be able to take great Macro Shots, but not landscapes. I have noticed that if I zoom into a picture enough I can ...
1
vote
0answers
177 views

Where can I get good criticism for my photos? [duplicate]

Possible Duplicate: Where to get community-based feedback on my photos online? How do I give someone a critique of their photograph? So one way to learn something and to be good at it is to ...
11
votes
4answers
4k views

Do digital cameras lose picture quality over time?

For some reasons when I look at my first pictures from my camera (DSLR), they look stunning. I know it could be just psychological. Another friend told me that her camera was really good when she ...
2
votes
2answers
422 views

Are there objective tests showing the the impact of a lens hood on image quality where there is no obvious flare?

I am familiar with the function of a lens hood, and I can understand that they could help to improve the contrast of pictures. However, I'm not convinced whether a lens hood does make all that much of ...
8
votes
4answers
712 views

Is it possible for a lens to produce too much contrast?

I came across a complaint that a certain lens produces too much contrast. The lens was described as rendering "cartoonish" contrast when shooting a portrait with diffused light from a window, where ...
11
votes
5answers
2k views

How does taking lower-resolution pictures with a higher-resolution sensor affect image quality?

Does taking a picture with 8 megapixel resolution with my Canon IXUS with a 1/2.3" sensor and 12M max resolution provides the same or worse image quality (particular, noise) as if the picture was ...
5
votes
4answers
2k views

Is an entry-level DSLR good enough for portrait photography?

I'm looking into starting a small at home portrait photography business mostly as a hobby for now, and I'm wondering if the camera I have now (Nikon D3000) is good enough for portrait photography. ...
4
votes
1answer
157 views

What makes a good sample image for ISO comparison?

To be more specific this image is always used by Digital Photography School for ISO comparison. What are those features that make this image suitable for ISO comparison.
7
votes
7answers
555 views

Is technical perfection necessary for an artistically awe-inspiring photograph?

What is your feeling in front of an awe-inspiring photograph (with really good composition, light, color, depth of field, etc.) but with unsatisfactory technical qualities (for example: JPEG ...
8
votes
2answers
2k views

Does rotating a photo count as a destructive editing?

I usually rotate all my jpg photos (using Windows Photo Viewer) after removing them from my camera's card. Is this correct? Am I losing quality for rotating them? Should I just leave them as they are ...
6
votes
3answers
204 views

What is the influence of the camera on the performance of a lens?

Shouldn't a lens be good or bad independently of the camera it is used with? After seeing these reviews at DxOMark I got confused. By changing the camera where the lenses are tested I get different ...
27
votes
6answers
3k views

Do megapixels matter with modern sensor technology?

Are more megapixels good? Are more megapixels bad? Do more megapixels increase detail? Do they make my images sharper? On the other side, is there a point that is too much? Do megapixels cause ...
1
vote
1answer
3k views

What causes outdoor photos to turn out bright white when taken with a digital camera?

I set my Canon Powershot A460 to automatic mode and took photographs outdoors. When I see the to-be-photographed area on the LCD, it appears normal; but when I take a picture, the photo turns out ...
6
votes
3answers
3k views

What is the difference between image size and image quality?

I have a Casio EX-S12. It has a setting for image size, but also a separate setting for what it calls "image quality". There are three image quality values: "Fine", "Normal", and "Economy". The Casio ...
5
votes
1answer
445 views

Scratches on negatives - me or them?

I've recently dug out my old SLR camera again. I've just got the prints and scans back from a reputable high-street company and I'm not very impressed with the results. For example: There's a big ...
5
votes
4answers
1k views

What tool produces better quality jpeg: Lightroom or Imagemagick?

I'm using Lightroom for photo workflow. At the end of it, I would like to have the best JPEG I can get, basically two options to choose from: - export from Lightroom to JPEG, using the 100% Lightroom ...
3
votes
4answers
999 views

Why does the quality of my pictures lower the more I zoom in?

I have a Canon 60D with the 18-200mm kit Lens. I was at the beach not too long ago, I took some pics of my son in the sand, from a very close distance and they came out great. Picture quality was top ...
9
votes
3answers
302 views

What are good test shots for finding out the capabilities of a camera?

I have a range of cameras from a (frankly awful) kiddie camera to a hybrid (Olympus Pen) and I want to take some pictures to test their (comparative) limitations. So I want to take the same photos ...
15
votes
5answers
902 views

How do I find the aperture that produces the highest-quality images for a given lens?

I'm not talking about large aperture (f/1.8, f/2.8...), rather, about small apertures (f/18, f/20, f/23...). I read somewhere (actually I think it was on this site, but I don't exactly remember which ...
11
votes
6answers
2k views

Does stacking more lens filters decrease overall image quality?

As stated by @t3mujin in another thread's comments: Stacking filters will decrease image quality, as it's another piece of glass light has to go through before reaching the sensor. I was ...
7
votes
4answers
1k views

How to take sharp photos while using maximum optical zoom?

When I shoot with high zoom (above 3X on my point-and-shoot camera), the sharpness of the picture seems to come down. Is it a feature of all cameras or is it due to higher sensitivity to camera shakes ...
7
votes
2answers
1k views

Can a video camera produce a high quality still photo shoot?

I have a high-end digital video camera able to output a higher number of megapixels than my digital photo camera. This is true only when using the camera to take stills. Is there anything that's going ...
25
votes
3answers
2k views

How can I test a new lens to make sure it is operating correctly?

How can I test a new lens to make sure it is operating correctly? I found two similar questions with answers specific to things such as sharpness and focus, but I want to cover any and all possible ...
7
votes
4answers
1k 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"?
41
votes
4answers
31k 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"?
5
votes
1answer
489 views

How can I improve the results of my proprietary RAW processing pipeline?

I am doing some experiment with Raw image processing using two post processing tools: Adobe PhotoShop (PS) CS5 Proprietary Image processing pipeline code. Data Capture: I captured some raw ...
4
votes
4answers
1k views

Why is Nextgen / wordpress is reducing the quality of my photographs?

I have been researching this night and day for months now. Photos viewed on my website look terrible compared to the same file viewed with other mediums. I have contacted many website support ...
7
votes
4answers
748 views

What should be considered for employee photos to put on company's website?

I work in the entertainment industry and am looking to produce friendly looking images of our employees (sales managers, customer support people, and so on) to put on our company's website. What ...
2
votes
1answer
390 views

How can I get objective, numerical Image Quality measurements for my photos?

I intend to take some raw images using my Canon-450D, and process them offline using some tool. Then I need to get some objective(numerical) metrics for those images like Image Noise, Image ...
3
votes
3answers
584 views

What's a good lens for my Canon G7?

I'm not a professional photographer, but I use my camera on a regular basis to photograph my familiy and activities I attend. I own a Canon G7 (older version of the G11) and instead of upgrading to a ...
3
votes
1answer
2k views

How do the Pentax 18-55mm and 18-135mm compare in image quality?

I've been reading a lot about the Pentax DA 18-135mm lens and its performance compared to other lenses. I've heard that this lens is very soft at 135mm regardless of aperture. However, I've also ...
19
votes
1answer
1k views

What is decentering?

I have heard of a condition in imperfect lenses known as "decentering". What is decentering? When a lens is decentered, what exactly is wrong with the optical elements? What are its symptoms and ...
4
votes
1answer
537 views

Do you suggest using an extender/tele converter with a Macro lens such as Canon 100mm f2.8 macro lens?

Do you suggest using a teleconverter with a dedicated macro lens? I have tried out using a Kenko TC with canon macro lens - however I am not 100% satisfied with the "extra" magnification that I got on ...
11
votes
3answers
460 views

How can one determine the ideal resampling algorithm for a given type of image?

Was reading this question and got to thinking. How exactly can you determine what the best resampling solution is? I have a concept, albeit somewhat vague, of what the basic methods do. Are there ...
17
votes
4answers
1k views

Does it give higher quality to shoot in low-res mode in-camera, or to downsize high-res photos later?

Suppose you want to store your photos at some lower resolution, let's say about ~1 MB large. You own a camera able to make photos at 5 MPix and more. And, you want to have the maximum quality at the ...
11
votes
1answer
3k views

Does image quality of a lens depend on the camera used?

I recently bought a Canon 50mm f1.8 for my Canon 1000d. But, I find that the images are not as sharp as those I saw in the reviews or any other images taken using other cameras like the 550d and ...
1
vote
2answers
403 views

Am I being unrealistic about image quality expectations from Canon 70-200 F/4 USM IS L Lens?

I'm shopping for a 70-200 F/4 USM IS L, and took a few test shots with it. Here's a full resolution jpeg, and a 100% crop with a focus point highlighted. It was shot handheld with IS on at 70mm / F4 ...
7
votes
5answers
536 views

What parameters can I use to evaluate a “Perceptual Image Quality”?

Might be a naive question, but I want to fix few subjective metrics / parameters which would let me decide image quality. I mean, I can use some objective metrics like Mean Squared Error or Mean ...
0
votes
2answers
270 views

Camera producing blurred images under average lighting conditions

I have an old digital camera (A Fuji Finepix 6900Z) that, in automatic mode, tends to produce extremely blurry images, especially under slightly darker lighting conditions, most of the time but not ...
12
votes
7answers
4k 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 ...