Presentation module - How to add and set background image?

To add backgroup image to the slide, open "Slide settings" dialog and on menu select "Slide" tab and click on "Add Image" button.

Choose image you would like to use as background and click on it.

Backround image image is stretched to fill the slide and bottom and right parts of image that would be displayed outside the slide are not visible.

The background image is basically another image on the slide, but it can not be selected, dragged and resized by mouse. Width, height and position can be set in menu under "Slide" tab. In example underneath the X-axis position of image is changed so the right skier is visible.