What is the difference between the 4:3 and 16:9 aspect ratio?
The aspect ratio of an image is its displayed width divided by its height (usually expressed as “x:y”). For instance, the aspect ratio of a traditional television screen is 4:3, or 1.33:1. High definition television uses an aspect of 16:9, or about 1.78:1. Aspect ratios of 2.39:1 or 1.85:1 are frequently used in cinematography, while the aspect ratio of a sync-sound 35 mm film frame is 1.37:1 (also known as “Academy Aperture” ratio). Silent films, which used the full frame, were shot in 1.33:1.