While video and image aspect ratios vary greatly across social media platforms, the 1:1 square aspect ratio is a very common one. It is also the most common ratio for icon and profile images.

An aspect ratio written in the format W:H is a simplified set of numbers where W is the units of width and H is the units of height.

This review was written for the special issue of IOVS to describe the history of optical coherence tomography (OCT) and its evolution from a nonscientific, historic perspective. Optical coherence tomography has become a standard of care in ophthalmology, providing real-time information on structure and function – diagnosing disease, evaluating progression, and assessing response to therapy, as well as helping to understand disease pathogenesis and create new therapies. Optical coherence tomography also has applications in multiple clinical specialties, fundamental research, and manufacturing. We review the early history of OCT describing how research and development evolves and the important role of multidisciplinary collaboration and expertise. Optical coherence tomography had its origin in femtosecond optics, but used optical communications technologies and required advanced engineering for early OCT prototypes, clinical feasibility studies, entrepreneurship, and corporate development in order to achieve clinical acceptance and clinical impact. Critical advances were made by early career researchers, clinician scientists, engineering experts, and business leaders, which enabled OCT to have a worldwide impact on health care. We introduce the concept of an “ecosystem” consisting of research, government funding, collaboration and competition, clinical studies, innovation, entrepreneurship and industry, and impact – all of which must work synergistically. The process that we recount is long and challenging, but it is our hope that it might inspire early career professionals in science, engineering, and medicine, and that the clinical and research community will find this review of interest.

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A 1:2 aspect ratio indicates a height that is double the width. Examples of 1:2 ratios are 100 pixels x 200 pixels, 450 ft. x 900 ft. and 12 square tiles x 24 square tiles (i.e. LED panels). A 1:2 aspect ratio is considered a tall or portrait ratio. Any aspect ratio with a height greater than width is classified as such. Additional portrait ratios include 2:3, 9:16 and 1:5. Aspect ratios are independent of size, so a 3 ft. wide by 3 ft. tall box would have the same aspect ratio as a 1mm wide by 1mm high pixel (1:1, square).

Video walls that are wider than 16:9 may be referred to as panoramic or wide. Video walls with a height greater than their width are called portrait. Ultra-wide ratio video walls are often called ribbon boards, and ultra-tall ratio video walls are often called pillars.

James Fujimoto, Eric Swanson; The Development, Commercialization, and Impact of Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2016;57(9):OCT1-OCT13. https://doi.org/10.1167/iovs.16-19963.

16:9 ratios (1.78:1) are the most commonly seen and used aspect ratio. They are today’s standard ratio for TV’s, monitors and portable devices. Most video is shot in a 16:9 resolution or close variation.

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A 1:1, or square aspect ratio indicates a width equal to height. Examples of square aspect ratios include 200 pixels x 200 pixels (200×200), 1m x 1m, and 50 widgets x 50 widgets.

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A plane mirror is a flat, reflective surface that produces an image of an object by reflecting light rays. It is also known as a flat mirror or a looking glass.

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Similarly, if you have an LED video wall that is 550 pixels wide by 75 pixels high (550x75p), then its aspect ratio is 22:3.

21:9 aspect ratios are the common ratio used for ultrawide or panoramic monitors, and it is very close in ratio to the anamorphic wide screen ratio (2.39:1) used in cinema.

In this example, the highest number that will divide evenly by both 640 and 480 is 160. So both numbers are divided by this GCF and written as W:H.

While an aspect ratio is not a fraction per se, calculating an aspect ratio as W:H uses the same math as simplifying a fraction.

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Aspect ratios are the proportion of an object’s width to height, written as W:H or N:1. They are important to understand when properly sizing images, videos, and video walls. Use our handy calculator to calculate any aspect ratio with a breeze, or calculate them yourself with some simple math.

1.85:1 (37:20) and 2.39:1 (239:100) are the 2 most commonly used aspect ratios for movies. 1.85:1 is sometimes called widescreen and 2.39:1 is called anamorphic widescreen. These 2 ratios are wider than the 16:9 ratio, allowing videographers to capture a wider horizontal frame.

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4:3, or 1.33:1 was the standard for video up until the late 90s/early 2000s before being replaced by 16:9. The most common 4:3 resolution on older TV’s was 640×480.

To calculate an aspect ratio as W:H, divide your width and your height by their greatest common factor (GCF), and write it as W:H, where W is units of width divided by the GCF and H is units of height divided by the GCF.

While the 4:3 aspect ratio has become virtually obsolete with video, it is still a common aspect ratio today for cameras and photography.

Aspect ratios are most commonly used for digital images, videos, or display screens. The primary unit of measurement for aspect ratios is pixels, but they can be measured in other units such as feet, meters, LED panels, or square (1:1) widgets.

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A 2:1 aspect ratio indicates 2 parts of width for every 1 part of height. Examples of 2:1 aspect ratios are 1,000 pixels x 500 pixels (1000×500), 600 ft. x 300 ft., and 20 led panels x 10 led panels (1:1 panels). 2:1 aspect ratios are classified as wide or landscape, since the width is greater than the height. Additional examples of landscape ratios would be 3:1, 16:9, and 4:3.

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Odds are that most of your photos are in the 3:2 ratio. Popularized by 35mm film, it is the most common aspect ratio in photography today.

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An aspect ratio is the proportion of an object’s width to its height, most commonly written as W:H, with W representing simplified units of width and H represents simplified units of height. Aspect ratios may also be written as N:1, where N = W/H. For example, a 16:9 aspect ratio can also be written as 1.78:1 (16/9:1).

These ratios also tend to change. To stay up-to-date on the latest social media aspect ratios, check out these useful links from Sprout Social:

The display of 4:3 footage onto a 16:9 display screen results in black vertical boxes on either side. This effect is also referred to as pillarboxing or reverse letterboxing.

Many LED video walls are built into the common 16:9 aspect ratio. However, part of the allure of video walls is their ability to be built into custom aspect ratios.

If you have ever noticed black horizontal bars on the screen when watching a movie at home, that is because your TV is 16:9 and your film is a wider aspect ratio.

Examples of units include pixels, feet, meters, and video wall panels. Any 2 dimensional units such as video wall panels must be square (1:1) for an accurate answer.

The exact aspect ratio of these monitors actually tends to be 64:27 (2.37:1), but they are advertised as 21:9 (2.33:1), likely for consistency with the well-known 16:9 ratio.