Image Aspect Ratios
Aspect ratio refers to the dimensions of the video frame, expressed as a ratio of the width to the height (horizontal and vertical aspects). Most video uses a 4:3 aspect ratio, but with the advent of new video standards, the 16:9 aspect ratio is becoming more common (Figures 18.18 and 18.19).
Figure 18.18. Video in the 4:3 aspect ratio is still prevalent.
Figure 18.19. Increasingly, video is shown in a 16:9 aspect ratio, which matches a common motion-picture aspect ratio. Premiere supports both 4:3 and 16:9.
Although ...
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