Table 6-3 lists the three standard aspect ratios.
The aspect ratio of the video may not directly correspond with the aspect ratio of the display. In
particular, the iPhone and iPod touch displays have an aspect ratio of 1.5:1 (480/320=1.5). To display for
1.78:1 and 2.35:1 aspect ratios, iPhone or iPod touch will letterbox , or add black bars to the top and
bottom. To display standard 1.33:1 videos, the device will pillarbox , or add black bars to the left and right
sides of the video.
However, iPhone and iPod touch also allow users to crop the video to fit the 1.5:1 aspect ratio of the
display by clicking the zoom button in video playback mode (see Figure 6-16 ). Zooming crops the video
image to fill the entire screen in any aspect ratio. Widescreen content is expanded in height to fill the
display and has its width chopped off that cannot fit into the display. For 4:3 videos, the top and bottom
are cut off so that the sides go edge to edge on the display.
When you are deciding the resolution size of your video, you will want to preserve the original aspect
ratio of your video, and then choose a resolution based on your needs (see Table 6-4 ). If your goal is
usability over the Internet, then choose a recommended size from the Wi-Fi or EDGE columns.
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