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Part: 3 Wrapping Up > Down to the Real Nitty-Gritty

Down to the Real Nitty-Gritty

The rest of this chapter is optional. You don't have to know the technical details that follow, but, as I said earlier, the more you know, the better your decisions are likely to be. If minute details are your thing, you'll love it. If not, I won't be insulted if you move along right about now.

Movies are usually filmed at a rate of 24 frames per second. NTSC displays (roughly) 30 frames per second. But each NTSC frame is divided into two “fields,” each containing half the information for the frame. So it's essentially displaying 60 fields per second, with each field holding half the pixels for a frame. The only way that can happen is if each frame is compressed.


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