Sixteenth HD1080

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Sixteenth HD1080 (or HD1080/16) is a display resolution that is the same aspect ratio and one 16th the area of 1080-line high-definition TV resolution.

HD1080 is 1920×1080 pixels, so dividing the resolution by 4 in each axis gives 480×270 pixels. This is a computationally convenient process, as HD1080 content can be scaled down simply by summing blocks of 16 pixels and dividing by 16 (arithmetic shift right 4 bits).

HD720 is 1280×720 pixels, i.e. 2⁄3 the resolution of HD1080 in each axis. HD720 content thus needs to be scaled by a factor of 3⁄8 in each axis, producing 3×3 pixels for every 8×8 pixels in. This is not as easy as scaling HD1080 content.

In practice, these displays are made with 272 rows of pixels where it is more convenient to manufacture pixels in multiples of 8×8. It also helps image compression and decompression, which is commonly done on 8×8 or 16×16 blocks of pixels.