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Get your desired fullscreen 4:3 aspect ratio height by entering the desired width for the image or video you want to resize. (Source:
You have to understand what aspect ratios are in order to easily move designs, images and compress digital video files/content from one medium to another without making any error in your calculations. For the record, the proportional relationship between the height and width of a rectangle is what is aptly referred to as an aspect ratio. (Source:
Aspect ratio of 4:3 ("Four-by-Three" or "Four-to-Three") which is also known as Standard Definition (SD) became wildly popular during the first days of moving picture cameras. It was early 1940s when movies originally photographed on 35 mm film could be also viewed on TVs that matched with this ratio. However its popularity is decreasing since the start of the 21st century when users of modern high-definition television sets, broadcast cameras and computer monitors started to favor the high definition 16:9 aspect ratio.
Long ago, when all television screens and computer monitors looked alike, they shared the same aspect ratio of 4 by 3. It dominated the way early cinema and television looked, but it was not meant to last. In the 21st century, new and emerging technology has resulted in more aspect ratios, like 16:9, leaving 4:3 as somewhat of a relic. But what is 4:3 aspect ratio, how did it get started, and why has it started popping up again in some movies?
The 4:3 aspect ratio is used in film and TV to denote the width and height of images that are 4 units wide by 3 units tall. This term is usually pronounced Four-Three, Four-to-Three, or Four-by-Three, and also known as 1.33:1. It was a default aspect ratio in 35mm celluloid film and remained so for many years in professional and amateur productions. It was the first aspect ratio for television sets, as well as computer monitors. Thus granting it the other official name of fullscreen, as the 4:3 aspect ratio would fit the entire screen of a standard TV set or monitor at the time. For the most part, 4:3 aspect ratio resolutions specifically refer to TV screens and monitors, as the more technical 1.33:1 specifically refers to celluloid and film/TV productions.