The Emulator tab either scales or crops the content to fit on the device, according to the information in the device profile.
From Adobe Device Central, select File > Open, navigate to an image file, and double-click the file.
In Photoshop or Illustrator, open a file. Select Save For Web And Devices and click Device Central.
In Adobe Premiere Pro or After Effects, open a file. Select File > Export > Adobe Media Encoder. Select H.264 from the Format drop-down menu, check Open in Device Central, and click OK.