When loading an application on an iPhone or iPad, a launch image can be shown to provide feedback to the user that the application is loading.
On the iPhone a Default.png was used, with the iPad we need to anticipate the device being started in any orientation.

Filename Dimensions
Default-Portrait.png * 768w x 1024h
Default-PortraitUpsideDown.png 768w x 1024h
Default-Landscape.png ** 1024w x 768h
Default-LandscapeLeft.png 1024w x 768h
Default-LandscapeRight.png 1024w x 768h
Default.png Not recommended

* If you have not specified a Default-PortraitUpsideDown.png file, this file will take precedence.

** If you have not specified a Default-LandscapeLet.png or Default-LandscapeRight.png image file, this file will take precedence.