Specifies the id of the texture to display. <a href="http://wiki.roblox.com/index.php?title=API:Class/ImageLabel/Image" target="_blank">More info</a>
Specifies how an image should be displayed. See ScaleType for more info.
If ScaleType is set to Slice, this Rect is used to specify the central part of the image. Everything outside of this is considered to be the border.
If ScaleType is set to Tile, this sets the size of the tile.