42 votes
Accepted

Why do people like square photos?

Square photos are not new, but given our mobile world, they have a unique benefit: they look the same whether viewed in landscape or portrait. Given that smartphones are normally used in portrait ...
  • 14.5k
23 votes

Would it be possible to make a 36×36 mm "full frame" sensor?

That's not correct. Look at this picture: The green rectangle is a 36x24 sensor. The green circle, which has a diameter of 43.3mm, is the minimal light spot needed for that size. The blue square is ...
  • 1,761
19 votes
Accepted

Why do compact cameras keep using 4:3 and not 3:2 like DSLRs?

4:3 (1.33) is a very good ratio. It's aesthetic and easy to get a nice composition in both horizontal and vertical orientation. It's also closer to square, which makes best use of optics (larger ...
  • 2,080
19 votes

Why is 16:9 aspect ratio rarely used in professional photography?

I expect that this is mostly due to technical limitations. DatAperture wrote it very nicely on Reddit: Lenses project circular images. To get the most resolution out of a lens, you should use a ...
  • 1,502
17 votes

Why do people like square photos?

The square photo format is as old as photography, not something new. (Even if TO and probably people in general have the impression that it is new). It has been a major tool in professional ...
  • 1,050
16 votes

How can I print a 3840×2160 pixel image on 4″×6″?

Strange question... You don't want to crop, you don't want borders, you don't want to stretch the image...but you want to somehow put one rectangle into another rectangle of a different aspect ratio. ...
  • 10.4k
15 votes
Accepted

How can I print a 3840×2160 pixel image on 4″×6″?

3840 x 2160 px means an aspect ratio of 16:9 - it is the reduced fraction of the pixel values: 3840:2160 -> (:20) -> 192:108 -> (:6) -> 32:18 -> (:2) -> 16:9 Since your images have ...
  • 6,467
15 votes
Accepted

Why is 16:9 aspect ratio rarely used in professional photography?

Adding on to @Orbit's answer regarding area of an inscribed rectangle in a circle, the following graph shows the area of 4:3, 3:2, and 16:9 aspect ratios. Area versus aspect ratio: square: 100% (...
  • 2,643
13 votes

Why aren't square CMOS sensors more popular by now?

Aesthetic considerations of the image aside, it's just mechanically obvious that a square fits inside of the image-circle produced by the camera's lens a lot better than a rectangle does. The short ...
  • 142k
11 votes

Why do people like square photos?

It could be something to do with Instagram which opened up perhaps the best and most natural platform for sharing quick snaps. However, being only a square format until recently, with the continued ...
11 votes

Why is 16:9 aspect ratio rarely used in professional photography?

The 35mm camera evolved into an image size that is 24mm x 36mm. This format was chosen by the German camera maker E. Leitz. One of his engineers, Oskar Barnack designed a 35mm still camera in 1913. At ...
  • 37.4k
10 votes

Why do people like square photos?

The major driver behind the trend of square photos was the explosive popularity of the Instagram app. Instagram from inception and for nearly five years only allowed for square images. The reason ...
  • 46.2k
10 votes

Would it be possible to make a 36×36 mm "full frame" sensor?

Is it possible and why it has not been done yet ? Not necessarily. A 24x36mm sensor will easily fit in an image circle that's too small for a 36x36mm sensor. Specifically, a 24x36mm sensor requires a ...
  • 31.5k
8 votes

Why do people like square photos?

I posted this in my comment, but here's a surprisingly simple reason: If you rotate a square image you don't have to rescale the image to display it in the same size. For a company like Instagram it ...
  • 1,241
8 votes
Accepted

Cropping images in post-production - how important is the image ratio?

Aspect ratio is only critical when matching to one printed paper size, or maybe to full screen monitor shape. Only one ratio fits another shape. And since many shapes exist, no one ratio number is ...
  • 12.7k
8 votes

Why do compact cameras keep using 4:3 and not 3:2 like DSLRs?

A 3:2 sensor ratio would be using a smaller share of the circular picture produced by the lens optics. That means - compared to 4:3 - either you get less pixels/quality, need a smaller sensor (with ...
  • 2,011
8 votes
Accepted

Is there a way to change the aspect ratio of a DNG file?

The DNG spec contains a tag DefaultScale: DefaultScale is required for cameras with non-square pixels. It specifies the default scale factors for each direction to convert the image to square ...
  • 142k
7 votes

What is the standard dimension of a picture to be viewed on a wide screen?

There is no "standard" picture aspect ratio in photography, only some common ones. 35 mm frames are 3:2. Old TV was 4:3. HDTV is 16:9. The way to pick the aspect ratio is to consider what the ...
  • 17.3k
7 votes

How can I resize this photo for a 16" x 20" frame?

Your image is more rectangular than your desired final product (16x20). The version of the image you're showing here is 960x660, so the width of your image is 50% longer than the height. If you want ...
  • 33.2k
6 votes
Accepted

What is the standard dimension of a picture to be viewed on a wide screen?

There is no specific standard, but there are a few aspect ratios that turn up a lot. Currently the 16:9 (1.77:1) ratio of HDTV (1920x1080) is probably the most common. Both 4K (3840x2160) and 8K (...
  • 171k
6 votes

When I resize photos from my DSLR, why do they come out 500×334 instead of 500×375?

The sensor ratio are different: The Nikon P90 sensor is 4/3 (4000*3000 pixels) The Nikon D5500 sensor is 3/2 (6000*4000 pixels) When resizing your images, you are probably fixing the length of the ...
  • 4,123
6 votes
Accepted

How do I fit a 16:9 or other non-square photo into a 1:1 image without cropping on iOS?

Your options for resizing the 16:9 image mentioned to be 1:1 in size are Crop it Letterbox it Stretch it Let's pretend the image is 16x9 instead of 16:9 (units are irrelevant.) Crop, taking the ...
5 votes

What's the best way to choose the aspect ratio: in-camera JPEG or RAW and cropping?

As the sensor is 3:2 that's the natural size to choose when shooting. Cropping can be done in post, where you have any option you want. If you crop when you shoot you waste pixels. In my experience ...
5 votes

Would it be possible to make a 36×36 mm "full frame" sensor?

The sensors could be made to a square format (though the current diameter would not accommodate 36x36mm, it would need to be about 30mm) if there was a demand for it. But by that logic the question ...
  • 9,519
5 votes

Why do compact cameras keep using 4:3 and not 3:2 like DSLRs?

I think it's useful to look at a few questions like Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR? Why don't sensors have a wider aspect ratio? What are the advantages of ...
  • 142k
5 votes

How are 16:9 images taken on a sensor with physical dimensions ratio 4:3?

The image is just cropped from 4:3 to 16:9. So yes, only a part of pixels is used.
  • 1,761
5 votes
Accepted

Why the highest resolution on smartphones is obtained for 4:3 aspect ratio?

That is the shape of the sensor. Whenever you shoot at a non-native aspect ratio, you must crop either from top and bottom or from left and right, so resolution drops. This is not specific to ...
  • 102k
5 votes

How can I print a 3840×2160 pixel image on 4″×6″?

First, let's help you ask the question correctly. What you should ask from now on is: Is the aspect ratio preserved between these two sizes? The answer in this case is no and here I explain how ...
4 votes

Bulk processing make images square no cropping

I'd recommend Imagemagick. Something like this should work (untested) FOR %a in (*.jpg) DO convert %a -resize 600x600 -background black -gravity center -extent 600x600 square_%a Full steps to get ...
4 votes

How do I get the right size image for a specific small photo frame?

It's easy: you take the desired DPI (dots per inch) and multiply it with the frame size. Say, your photolab (or printer) prints with 300 dpi. Then your picture must be at least 2.5*300 x 3.5*300 = ...
  • 1,761

Only top scored, non community-wiki answers of a minimum length are eligible