CHAPTER 21
High Definition vs. Standard Definition
High Definition (HD) video is the new standard for video in the United States. As of the time of this writing, there are two primary formats for high-definition video – 720p and 1080i/1080p. The “p” indicates progressive scan, while the “i” indicates an interlaced image. We’ll discuss this in more detail later in this section. High-definition video is also widescreen (16:9 screen ratio).
Standard Definition (SD) is what we’ve been watching pretty much since television was invented. The screen has far fewer lines of resolution and is traditionally a 4:3 ratio screen, although it can be presented in 16:9 format as well. Standard definition is on its way out (much like the days of black-and-white ...
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