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Image Aspect Ratios

Aspect ratio refers to the dimensions of the video frame, expressed as a ratio between the width and 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 18.17 and 18.18).

Figure 18.17. Video in the 4:3 aspect ratio is still prevalent.



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