Splash Screen

iPhone-only applications:
iPhone-only applications may only have one launch image. It should be in PNG format and measure 320 x 480 pixels. Name your launch image file Default.png.
For iPhone 4 high resolution, you can include an additional launch image. It should be in PNG formate and measure 640 x 960 pixels. Name it Default@2x.png. This image will get picked up by the iOS if your app is running on an iPhone 4.

Note: If your app is not running on an iPhone 4, and you provided both Default.png and Default@2x.png, iOS will automatically pick up Default.png as the launch image.

iPad-only applications:
Create a launch image for each supported orientation in the PNG format. Each launch image must be 1004 x 768 pixels (for landscape) or 748 x 1024 pixels (for portrait).
Default launch image files:

• Default-PortraitUpsideDown.png - upside-down portrait version.
• Default-LandscapeLeft.png - left-oriented landscape version.
• Default-LandscapeRight.png - right-oriented landscape version.
• Default-Portrait.png - generic portrait version.
• Default-Landscape.png - generic landscape version.
• Default.png - default portrait launch. Its usage is strongly discouraged, use more specific launch images instead.

Note: For iPad-only applications, it is common application to provide only Default-Portrait.png and Default-Landscape.png. More specific launch images will take precedence over the generic versions, for example Default-PortraitUpsideDown.png takes precedence over the Default-Portrait.png image file for this specific orientation. See the "Providing Launch Images for Different Orientations" section on the iPad Programming Guide for more information.

Universal applications:
Include launch images for both iPhone and iPad. iPhone launch image will still be named Default.png and Default@2x.png. Name your iPad portrait launch image Default-Portrait.png (do not use Default.png as the iPad portrait launch image).