Aspect Ratio Converters change picture aspect ratio – usually between 16:9 and 4:3. Other aspect ratios are also allowed for, such as 14:9. Custom values can also be used. Technically, the operation involves independent horizontal and vertical resizing and there are a number of choices for the display of 4:3 originals on 16:9 screens and vice versa (e.g. letterbox, pillar box, full height and full width). Whilst changing the aspect ratio of pictures, the objects within should retain their original shape.

See also: Aspect ratio