It standardized everything at 1280 X 720 pixels which is three times as many pixels in the image as standard definition video. That's where we started and that's where computers handled video in the '90s. Sometimes they're widescreen so they're wider than 640 pixels across but still 480 pixels high. It was adopted by DVD's so DVD's used standard resolution although not always 640X480. This is the resolution that you got on standard TV say in the '70s and '80s, although they weren't digital so the pixels were kind of blurry. Standard definition video can be defined a lot of different ways but one way to look at as 640 X 480 pixels totaling 307,000 pixels. At the upper left we see the standard definition video. What is 4K video and how is it different than what we had before? So let's look at four main video resolutions that we've dealt with over the years. And the new Apple TV can play back 4K video. There's been a lot of talk about video resolutions because the new iPhones can record up to 4K video. Video Transcript: So let's take a look at video resolutions. Check out Understanding Video Resolutions at YouTube for closed captioning and more options.
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