The Distort command, which isn't discussed elsewhere in this book, creates four corner handles around an image. You drag each corner handle to distort the selected image in that direction. Unfortunately, you can't add other points around the edges to create additional distortions, which can be frustrating if you're trying to achieve a specific effect. If you can't achieve a certain kind of distortion using Edit ^ Free Transform, the Shear filter may be your answer.
Shear distorts an image along a path. When you choose Filter ^ Distort ^ Shear, you get the dialog box shown in Figure 11-30. Initially, a single line that has two points at either end appears in the grid at the top of the box. When you drag the points, you slant the image in the preview. This, plus the fact that the filter is named Shear — Adobe's strange term for skewing (it appears in Illustrator as well) — leads many users to dismiss the filter as nothing more than a slanting tool. But in truth, it's more versatile than that.
Figure 11-30: Click the grid line in the left corner of the Shear dialog box to add points to the line. Drag these points to distort the image along the curve.
You can add points to the grid line simply by clicking on it. A point springs up every time you click an empty space in the line. Drag the point to change the curvature of the line and distort the image along the new curve. To delete a point, drag it off the left or right side of the grid. To delete all points and return the line to its original vertical orientation, click the Defaults button.
The Undefined Areas options work just as they do in the Wave dialog box (described in the preceding section). You can either fill the gaps on one side of the image with pixels shoved off the opposite side by selecting Wrap Around or repeat pixels along the edge of the selection by selecting Repeat Edge Pixels.
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