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When you’re watching a video, double-tapping eliminates or restores letterbox bars.
See, the iPhone’s screen is bright, vibrant, and stunningly sharp. It’s not, however, the right shape for videos.
Standard TV shows are squarish, not rectangular. So when you watch TV shows, you get black letterbox columns on either side of the picture.
Movies have the opposite problem. They’re too wide for the iPhone screen. So when you watch movies, you wind up with letterbox bars above and below the picture.
Some people are fine with that. At least when letterbox bars are onscreen, you know you’re seeing the complete composition of the scene the director intended.
Other people can’t stand letterbox bars. You’re already watching on a pretty small screen; why sacrifice some of that precious area to black bars?
That’s why the iPhone gives you a choice. If you double-tap the video as it plays, you zoom in, magnifying the image so that it fills the entire screen.
Part of the image is now off the screen; now you’re not seeing the entire composition originally broadcast. You lose the top and bottom of TV scenes, or the left and right edges of movie scenes.
If this effect winds up chopping off something important—some text on the screen, for example—restoring the original letterbox view is just another double-tap away.
iPhone: The Missing Manual By David Pogue is available in our "BOOKS" area.
