Radial blurring

Choosing Filter ^ Blur ^ Radial Blur displays the Radial Blur dialog box shown in Figure 10-28. The dialog box offers two Blur Method options: Spin and Zoom.

Figure 10-27: The result of combining the Wind and Motion Blur filters with a translucent selection.
Figure 10-28: Drag inside the Blur Center grid to change the point about which the Radial Blur filter spins or zooms the image.

If you select Spin, the image appears to be rotating about a central point. You specify that point by dragging in the grid inside the Blur Center box (as demonstrated in the figure). If you select Zoom, the image appears to rush away from you, as if you were zooming the camera while shooting the photograph. Again, you specify the central point of the Zoom by dragging in the Blur Center box. Figure 10-29 features examples of both settings.

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Spin, Draft

Spin, Best

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Zoom, Draft Zoom, Best

Zoom, Draft Zoom, Best

Figure 10-29: Four examples of the Radial Blur filter set to both Spin and Zoom, subject to different Quality settings (left and right). I specified Amount values of 10 pixels for the Spin examples and 30 for the Zooms. Each effect is centered about the right eye (your right, that is).

After selecting a Blur Method option, you can enter any value between 1 and 100 in the Amount option box to specify the maximum distance over which the filter blurs pixels. (You can enter a value of 0, but doing so merely causes the filter to waste time without producing an effect.) Pixels farthest away from the center point move the most; pixels close to the center point barely move at all. Keep in mind that large values take more time to apply than small values. The Radial Blur filter, incidentally, qualifies as one of Photoshop's most time-consuming operations.

Select a Quality option to specify your favorite time/quality compromise. The Good and Best Quality options ensure smooth results by respectively applying bilinear and bicubic interpolation (as explained in the "General preferences" section of Chapter 2). However, they also prolong the amount of time the filter spends calculating pixels in your image.

The Draft option diffuses an image, which leaves a trail of loose and randomized pixels but takes less time to complete. I used the Draft setting to create the left-hand images in Figure 10-29; I selected the Best option to create the images on the right.

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