Click different areas on the image to create multiple Pins, which are potential blur areas. Click the dark line inside the circle and drag it around the circle to increase or decrease the blur effect.

In Elements, add the mask manually by clicking the circle-within ... Mouse over to your image and paint across your subject’s heads. If you conceal too much of the blur, press X to swap color ...

If you have no control over the background during your shoot, you can still make alterations using an image editing application such as Photoshop. Photoshop contains a Blur tool which can be used ...

The circle of confusion is the blur circle formed when a point source of light (like a star or a distant point) is out of focus. Instead of a sharp point, it appears as a small circle on the image ...