Aspect Ratio

The relationship of the height and width of any image. The aspect ratio of an image must be maintained to prevent distortion.

1. In facsimile or television, the ratio of the width to the height of a scanning field or image. Note: For example, the classical NTSC television standard specifies an aspect ratio of 4:3, and the new high-definition television standard specifies 16:9. 2. The ratio of the width to the height of any video or scanned image display.