High Definition Video Large 1280 x 720 pixels vs. Full hd 1920 x 1080 pixels


UP TO SPEED: Large vs. Full
High-def video 1080p picture is made up of 1,920 pixels by 1,080 pixels while the standard TV: 640 x 480 pixels.
High-def video takes up a large amount of hard drive space: 26 gigabytes per hour.
If your 500-gig drive is already half full with programs, photos, music, and other software, you’ve got room for only 9 hours of high-def video.
HD video is much too big for a standard DVD, for example, whose picture is only 640 x 480 pixels. It’s too big to stream from a web page, too. The size even be too big to fit on your monitor. A 21.5-inch iMac has a maximum resolution of 1920 x 1080 pixels—just fits for a 1080p movie. Mac laptops, only the 17-inch MacBook Pro has 1280 x 720 pixels.)
So Apple is offering you the opportunity to import your video at a scaled-down large size: 960 x 540 pixels. If you do the math, you’ll realize that that’s actually only one-quarter the area of the original high-def picture (half the area in each dimension), which makes Apple’s name for this option—Large—a little suspicious.
Importing your high-def video in the Large (quarter-size) format means that each hour of video takes up around 10 gigabytes of disk space instead of 26. You also get smoother playback on slower Macs.
Showcases—like a DVD, the Web, or computer-screen playback—the resolution is still sensational. It’s unlikely that you’d see any difference between the Large and the Full settings in most cases.
Full setting is appropriate,when you plan to export your edited movie to Final Cut Pro (Apple’s professional video-editing program).
When you intend to broadcast it on TV or use it in an actual, professional movie; or when you hope to burn it to a high-definition DVD.
Also, video-sharing websites like YouTube and Vimeo can display full-HD videos for those movies that need to look especially great.

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