Turning an image into a background is as easy as 1-2-3. Drag and drop the image right onto the page from a folder on your computer. Keep in mind that images dropped directly on a page are saved to the uncategorized album and can be organized later.
With the image still selected, click the Convert to Background button.
The image automatically fills the entire design area and becomes the bottom layer. Don’t forget to Save your changes.
Now, let’s add a background to a two-page spread. Drag and drop the image onto the page from a folder on your computer.
In order for the background to apply to both pages, they must be linked. Click the Link button. Take note, the gutter that separated the two pages has now disappeared.
Note: The image will need to cross the center of the two pages or the Link button will not appear in the contextual menu.
Click the Convert to Background button.
The image turns into a background covering the entire spread. Don’t forget to Save.
A message appears if the quality of the image will become low resolution (below 200 DPI) after it is converted into a background. Check out this article to learn more about image quality.
Here is a short video: