Canon PIXMA MG6320 Online Manual page 106

The Select Background dialog box appears.
3. Select a background.
Select the type of background you want to use in the Select Background dialog box.
When No background is selected
The background will be blank (white).
When a sample image is selected
The selected image is set as the background.
When Single color is selected
The Color dialog box appears. Select the color you want to set, then click OK.
When Photo is selected
You can insert a photo of your choice into the background.
Note
Single color and Photo do not appear depending on the item type and selected theme.
4. Click OK.
The selected background is set for the selected page.