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Understanding QuickTime > Understanding QuickTime - Pg. 288

Understanding QuickTime Unfortunately, most computers are far too slow to open up 30 full-screen, pho- tographic-quality pictures per second. Even if they could, full-screen, full-quality QuickTime movies would still be mostly useless. Each would consume hundreds of gigabytes of disk space, requiring days or weeks to download from the Web or by email--a guaranteed way to annoy citizens of the Internet and doom your movie- making career to obscurity. That's why most QuickTime movies aren't full-screen, photographic-quality flms by any stretch of the imagination. In fact, most QuickTime movies are much "small- er"--in three different dimensions: ·Thewindowismuchsmaller. It's rare to see a QuickTime movie that, when played back, flls the computer screen. Instead, most QuickTime movies today play in a much smaller window (see Figure 12-3), therefore requiring far less data and resulting in far smaller fles. ·Theframerateislower. Instead of showing 30 frames per second, many QuickTime movies have far lower frame rates; even ffteen frames per second produces smooth motion. On the Web, especially during live QuickTime "broadcasts," still lower frame rates are common, such as two or fve frames per second. This kind of movie is noticeably jerky, but sends so little data that people using telephone-line modems can watch live events in this format.