Canon PIXMA MG2440 - Manual (Page 197)

Note
If only one image is selected, only the preview appears and the Selected Images
area does not appear.
4. Click Blur Background.
Note
The effect level can be changed by moving the slider displayed below Blur
Background.
When the cursor is moved over the Preview area, the shape of the cursor
changes to (Pen).
5. Specify the focus area (area that will not be blurred) with a line by
clicking along its outline.
197