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48 votes

Does Wi-Fi affect the quality of images downloaded from the Internet?

Does downloading an image off a website when WiFi is strong result in a higher quality image on your device? Signal quality does not usually affect the transmission of data that is sent, though it ...
xiota's user avatar
  • 27k
41 votes

If an image is rotated losslessly, why does the file size change?

This is most likely caused by entropy coding, which is the final lossless stage of JPEG compression, after the image data has been quantized to reduce its size. When a JPEG image is losslessly ...
Ilmari Karonen's user avatar
33 votes
Accepted

Will a lens upgrade from the kit lens give me better colors on my backpacking travels?

"Better image quality." You use that phrase. When we say image quality in reference to comparing two lenses, we rarely are talking about anything with regard to which one is "... less dark and gives ...
Michael C's user avatar
  • 175k
31 votes

What is the "optimal" file size of JPEG images with respect to their dimensions?

The size of files compressed with JPEG vary depending on the complexity of the image. Trying the control the file sizes the way you describe will result in highly variable perceived image quality. ...
xiota's user avatar
  • 27k
30 votes
Accepted

Why is this smartphone picture better than this dedicated camera picture?

No, your camera sensor is not bigger than your smartphone sensor, they are both about 1/2,5". The difference is that your Canon camera uses ancient sensor technology (more noise), smaller aperture (...
szulat's user avatar
  • 5,059
28 votes

An image with lower resolution is of higher file size while that of a higher resolution is of lower file size. How does that happen?

The reasons to have difference in size can be (and most of them are related to image compression): Amount of details in the image. Save flat colour image and another with several colours and you will ...
Romeo Ninov's user avatar
  • 12.2k
27 votes

Are online photos safe from damage?

one of my Facebook accounts seem to have lost a significant amount of resolution Facebook (and other social media sites) compress photos while storing/displaying. Considering the amount of data that ...
suvartheec's user avatar
27 votes

How important is a good quality camera for good photography?

As with many things, the end quality depends on the weakest link. Because most cameras are quite good, even cheap ones (even from mobile phones), the weakest link is mostly the person behind the ...
Michel Keijzers's user avatar
27 votes
Accepted

Unable to get good low light photos with Canon EOS R5

Considering these are high ISO and 100% crops, I'd say these are excellent images! I understand the desire for yet even better, we all have that. Given your shooting examples (which I still think are ...
user10216038's user avatar
  • 2,239
26 votes

If an image is rotated losslessly, why does the file size change?

I went ahead and repeated the experiment to see if I could figure out what's going on. Procedure I generated a random 256-by-256 pixel RGB image using the "Solid Noise" filter in GIMP (Filters > ...
2012rcampion's user avatar
24 votes
Accepted

Does aliasing occur in film photography?

No. Aliasing is result of sampling, taking discrete samples or readings of a signal, at a low enough frequency that the frequencies in the input signal are confused for other frequencies, such that ...
scottbb's user avatar
  • 32.9k
24 votes

My mentor says to set image to Fine instead of RAW — how is this different from JPG?

you don't have to reproduce the algorithms that the camera is running to render your photo on the small display on the camera. This all depends on how much you value what is shown on the camera's LCD ...
Philip Kendall's user avatar
23 votes

Why is this smartphone picture better than this dedicated camera picture?

The primary reasons for the differences in image quality between the two cameras are the settings and technique used to capture the image, not sensor technology. To get sharper images, increase ISO, ...
xiota's user avatar
  • 27k
23 votes
Accepted

What type of editing is necessary to achieve this type of watch photo?

To me, it is just that you dial is over-exposed, easy to fix with the Curves tool of your editor: In other cases, just using the contrast tool could be easier, but here this would blow out the ...
xenoid's user avatar
  • 21.5k
22 votes

An image with lower resolution is of higher file size while that of a higher resolution is of lower file size. How does that happen?

For these two photos: as shown by ImageMagick's identify, the bird is JPEG quality 100 and the llamas are JPEG quality 92). This alone would be enough to explain ...
xenoid's user avatar
  • 21.5k
20 votes

If an image is rotated losslessly, why does the file size change?

EDIT: This answer was posted before I knew that the files had increased in size by around 9 KiB (9055 bytes for the 256×256 image, 9612 KiB for the 512×512 image). In all likelihood, when you first ...
scottbb's user avatar
  • 32.9k
20 votes

Is there a noticeable difference in image quality between Micro Four Thirds and APS-C entry-level DSLR cameras?

A great deal here depends on when you (generally) take pictures. In particular, with bright light, a smaller sensor makes little or no difference in quality. As the light level drops, however, a ...
Jerry Coffin's user avatar
  • 19.3k
19 votes
Accepted

What exactly is causing the quality difference between these two photographs?

While both shots were taken in daylight, the left shot was lit directly by sunlight, whereas the right shot looks like it was under shade. The direct lighting produces hard shadow lines, and more ...
scottbb's user avatar
  • 32.9k
19 votes
Accepted

Why the color is different in two pictures in similar conditions and setting?

The camera's metering system and auto white balance system are basically a database of many shooting scenarios, and the camera tries to "guess" what you are shooting and how you want it to ...
osullic's user avatar
  • 12.5k
18 votes
Accepted

Does converting image file formats affect quality?

Going from JPG (which is a lossy format) to any lossless one (like PNG) does not. Going from any format to a lossy one, yes, including JPG to JPG. It could be too little to notice, and using the same ...
Rafael's user avatar
  • 25k
18 votes

What is the "optimal" file size of JPEG images with respect to their dimensions?

No. This is a wrong approach. File size in pixels, yes, has something to do with the final weight, but it is not the only factor. Make a test. Take a completely white file of the same 2400x600px, ...
Rafael's user avatar
  • 25k
18 votes

Why is Nikon 1.4g better when Nikon 1.8g is sharper?

1) Sharpness is complicated. Lens sharpness is just one aspect of the overall resolving power of a camera system. The appearance of crispness is separate from the rendition of detail. And a lens can ...
mattdm's user avatar
  • 143k
17 votes

Are there standards for 5 star rating scales of photos?

There is no absolute standard, nor is there any standard that is generally applicable or generally accepted. There are certainly certain situations where specific systems are used — your example list ...
mattdm's user avatar
  • 143k
17 votes
Accepted

Are there standards for 5 star rating scales of photos?

There are no standards as much of it is subjective. Even though I consider myself to be very rigorous, I find that there is a drift over time. This the intention of my rating system: The 3-star ...
Itai's user avatar
  • 103k
17 votes

How to increase the quality of photos taken through a DSLR?

I have been shooting for six months now using my Nikon D5600 and the 18-55 mm kit lens. You would probably benefit from using a prime for a while. Pick up a 35mm or 50mm prime. Then shoot with it as ...
xiota's user avatar
  • 27k
16 votes

Is there a noticeable difference in image quality between Micro Four Thirds and APS-C entry-level DSLR cameras?

In practice this is not a concern unless you have very demanding needs. Now I would preface this by saying that my view of "image quality" is that many people, particularly beginners, tend to make ...
StephenG - Help Ukraine's user avatar
16 votes

Which picture has better quality?

Greater KB — bigger files — means more data, but doesn't necessarily mean more information. A file with a lot of sharp detail will be bigger than a blurry one, but also a file with lots of noise will ...
mattdm's user avatar
  • 143k
16 votes

How important is a good quality camera for good photography?

Gear doesn't matter... until it does. While it is true that better gear won't make you a better photographer, it is equally true that any photographer is limited by the capabilities of the gear being ...
Michael C's user avatar
  • 175k
15 votes
Accepted

What causes these streaked rays from light sources?

In my opinion that "flare" is caused by a dirty lens. I'm guessing you attempted to clean it, by using a wipe, but failed to properly clean it, which is why the flare has directionality. Try using a ...
Rafael's user avatar
  • 25k

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