63 votes
Accepted

Why are some big telephoto lenses so expensive compared to telescopes?

Rarity. There were only approximately 20 of these now out of production lenses ever made. When they were in production they sold for about $90,000 (US). Due to the time needed to grow the large ...
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  • 167k
58 votes

Does simply opening and closing a JPEG file decrease image quality?

This is based on a misunderstanding. Loss of quality happens only during the compression that is done when an image is saved as JPEG. But it doesn't matter whether it was edited or not. So: you will (...
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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 ...
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  • 26.2k
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 ...
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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 ...
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  • 167k
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 (...
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  • 4,835
30 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. ...
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  • 26.2k
28 votes
Accepted

If I want to shoot darker shots, is it better to increase the lighting and then darken in post to retain clarity?

The look you are going for is known as low key lighting. It is not necessary for the room to be dark. You just need to put enough light on your subject that there is a large enough difference between ...
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  • 167k
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 ...
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  • 9,253
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 ...
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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 ...
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  • 2,103
26 votes
Accepted

What turned the colors psychedelic?

What you're seeing is colors produced by the multiple layers of plastic you're looking through along with polarized light from either the plastic itself, the sky, or both. According to this page, the ...
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  • 6,126
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 > ...
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26 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 ...
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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 ...
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  • 19.7k
23 votes

Does simply opening and closing a JPEG file decrease image quality?

Absolutely not. You need to edit the file and re-save it as a JPEG in order to compound the effects of image compression. Just viewing it has no effect at all — if it did, all of the JPEGs on the web ...
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  • 1,262
23 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 ...
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  • 31k
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, ...
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  • 26.2k
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 the size difference (the other factor,...
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  • 16.1k
20 votes
Accepted

How viable is copy pasting a professional's settings so that a noob can produce high quality photos?

How viable are "photography templates" where a professional gives the exact settings to use in a specific set up...to allow noobs to produce high quality photos? That sounds a lot like the "scene"...
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  • 31.2k
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 ...
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  • 31k
19 votes

If I want to shoot darker shots, is it better to increase the lighting and then darken in post to retain clarity?

Just because the image is mostly black doesn't mean the scene is dark. With a flash positioned on the left pointing at the subject (he's facing the flash) and a black backdrop you could possibly even ...
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  • 8,334
19 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 ...
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  • 18.7k
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 ...
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  • 31k
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, ...
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  • 20.7k
17 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 ...
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  • 20.7k
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 ...
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  • 140k
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 ...
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  • 101k
17 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 ...
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  • 140k

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