STRAIGHTEN BUILDINGS with the Lens Correction filter Depending
STRAIGHTEN BUILDINGS with the Lens Correction filter Depending on the focal length of a camera lens or the f-stop used, a photograph may show common lens flaws such as barrel and pincushion distortion. Barrel distortion causes straight lines to bow out toward the edges of the image. Pincushion distortion is the opposite effect, where straight lines bend inward. If the camera tilts up or down or at any angle, the perspective also appears distorted. The Lens Correction filter in Photoshop CS3 can help you fix these and other lens defects easily. When you photograph tall buildings, the tops of the buildings may appear to be larger at the top than the bottom. The Lens Correction filter enables you to easily line up the perspective of the buildings with a vertical plane. You can use the filter s image grid to make your adjustments more accurately, or you can turn the grid off if you choose. The filter even has an option to let you select how to correct the missing areas along the edges that occurred when the perspective was repaired. 22 44 55 33 11 62 1 Open an image showing a tall distorted building as a smart object or open a file and convert it to a smart object layer. Note: See Task #19 for information about smart objects. 2 Click Filter. 3 Click Distort. 4 Click Lens Correction. The Lens Correction dialog box appears with a large preview of the image and a grid overlay. 5 Drag the Vertical Perspective slider to align the tallest building with the grid.
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