Keystoning

If a photo is taken from a low angle, distortion is likely to appear. Open the file Ch10_Keystone.psd. The strong horizontal and vertical lines make the distortion easy to see.

Step 1. First get the picture properly aligned horizontally using the previous technique with the Measure tool. Don't worry about cropping yet.

Step 2. Zoom out and resize the window so that you can see some of the gray area around the photo.

Step 3. Make sure your rulers are visible. If not, press HX+®

Step 4. Drag two guides out to match the vertical lines. Line them up along the bottom edge if the photo was taken from a low angle (use the top edge for a high-angle shot).

Step 5. Make sure the photo layer is floating. If it's called Background, double-click and rename the layer.

Step 6. Access the Free Transform command by pressing jj-a+q

Step 7. Enable the Perspective transform by clicking or right-clicking on a two-button mouse. Drag the top handles apart to correct the keystoning of the image.

Step 8. Enable the Distort transform by clicking or right-clicking on a two-button mouse. Drag the corners individually to finalize the correction. Make sure snapping is off (View>Snap) or the fine-tuning will be difficult.

Step 9. Apply the transformation by pressing the key or clicking the Apply button.

Step 10. Crop the image or clone in the missing areas.

Once the distortion is corrected, proper perspective is regained.
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