Motion blurring

The Motion Blur filter makes an image appear as if either the image or camera was moving when you shot the photo. When you choose Filter ^ Blur ^ Motion Blur, Photoshop displays the dialog box shown in Figure 10-23. You enter the angle of movement into the Angle option box. Alternatively, you can indicate the angle by dragging the straight line inside the circle on the right side of the dialog box, as shown in the figure. (Notice that the arrow cursor actually appears outside the circle. Once you begin dragging on the line, you can move the cursor anywhere you want and still affect the angle.)

Figure 10-23: Drag the line inside the circle to change the angle of the blur.

You then enter the distance of the movement in the Distance option box. Photoshop permits any value between 1 and 999 pixels. The filter distributes the effect of the blur over the course of the Distance value, as illustrated by the examples in Figure 10-24.

Original

50 pixels

100 pixels

200 pixels

300 pixels

500 pixels

Figure 10-24: A single black rectangle followed by five different applications of the Motion Blur filter. Only the Distance value varied, as labeled. A 0-degree Angle value was used in all five examples.

Original

50 pixels

100 pixels

200 pixels

300 pixels

500 pixels

Figure 10-24: A single black rectangle followed by five different applications of the Motion Blur filter. Only the Distance value varied, as labeled. A 0-degree Angle value was used in all five examples.

Note Mathematically speaking, Motion Blur is one of Photoshop's simpler filters. Rather than distributing the effect over a Gaussian curve — which one might argue would produce a more believable effect — Photoshop creates a simple linear distribution, peaking in the center and fading at either end. It's as if the program took the value you specified in the Distance option, created that many clones of the image, offset half the clones in one direction and half the clones in the other — all spaced 1 pixel apart — and then varied the opacity of each.

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Photoshop Secrets

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