Game Development Reference
In-Depth Information
If your Source Image does not have a border set (a border with
dimensions | 1), then you will get a warning when setting the Image
Type to Sliced , informing you that the image cannot be used in this
mode without a border.
As you can see, the preview window shows the border positions as well as an
additional Fill Center option, which when checked will draw the entire image in
the Rect Transform with non-uniform scale; unchecking it will remove the portion
of the image within the border square.
Note: An image that has a border defined cannot be used for a Tiled
image (see the following screenshot). Additionally, when you apply an
image with a border to an Image control, it will automatically default
to a Sliced Image type.
Tiled Images
Instead of scaling the source image, Unity also provides the option to tile an Image
within the bounds of the GameObject's Rect Transform . By setting the Image Type
option to Tiled , the image will then tile both horizontally and vertically from the
bottom-left point of the Rect Transform as shown here:
 
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