In multi-device development, one of the issues to deal with is displaying the same content in different screen resolutions. Corona SDK offers a simple solution by specifying the scaling mode in the config.lua file. The scaling modes include: none, letterbox, zoomEven, zoomStretch. Sometimes it’s easier to understand by seeing the visual difference than reading the docs.
Below are the 4 modes displayed in four different devices (starting top-left clockwise: Galaxy Tab, iPad, iPhone & iPhone 4). The background photo is loaded at the Galaxy Tab screen resolution (1024×600).
To view the original full-size images, click on the images to view at Flickr (then choose Actions -> View all sizes), or use the links at the bottom of this post.
Hope this is useful.