"Effect: Bubble" dialog box

Used to apply an effect that resembles bubbles.

[Center] field

Displays the center of the effect. The position of the center is specified by dragging the mark, provided in the dialog preview display.

[Radius] field

The radius of the effect is displayed as a number of pixels. The radius is specified by dragging the mark, provided in the dialog preview display.

[Strength] slider

Used to specify the degree of the bubble effect within a range of 1 to 100.