1 BLUR METHOD
The filter offers two different types of blur. Spin works in a circular motion around the center point, while zoom pushes the blur outwards from the center point, like a zoom burst. Spin is useful for adding blur to wheels, for example, so that vehicles appear to be moving fast. Zoom is not only useful for blurring clouds like this, but also for creating all manner of vortex-like effects – try using it on the background in an action portrait for a dynamic blurred backdrop.
2 SELECTIVE BLUR
The Radial Blur filter is most useful when you apply it selectively to parts of your photo, like the sky here. First make a duplicate layer (Ctrl/Cmd+J), then select the area. The Quick Selection tool is ideal for selecting…