1.78 for HD, 1.33 for SD.<\/p>\n
Aspect ratio is the quotient of screen’s width and screen’s height. For example, a standard definition frame is 4 units wide and 3 units tall which is 4:3=1.33. Aspect ratio for SD is commonly expressed as either 1.33, 4×3 or 4:3.<\/p>\n
The HD screen is wider. It is 16 units wide and 9 units tall which is: 16:9=1.78. You will see any of these: 1.78, 16×9 or 16:9. Sometimes you may run into 1.77 which is practically the same as 1.78.<\/p>\n
The difference in aspect ratios between HD and SD requires you to specify the target aspect ratio when creating SD downconversions<\/a>.<\/p>\n <\/p>\n Fig.1. High Definition and Standard Definition Aspect Ratios<\/p>\n","protected":false},"excerpt":{"rendered":" 1.78 for HD, 1.33 for SD. Aspect ratio is the quotient of screen’s width and screen’s height. For example, a standard definition frame is 4 units wide and 3 units tall which is 4:3=1.33. Aspect ratio for SD is commonly expressed as either 1.33, 4×3 or 4:3. The HD screen is wider. It is 16 … Continue reading Aspect Ratios<\/span> ![\"1.78](\"http:\/\/www.hdhead.com\/illustrations\/aspect_ratios.jpg\" "\\"1.78")
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