1 USE THE UPRIGHT MODES
To fix geometric distortion in images quickly and easily, use the automatic upright modes in the Geometry panel, such as Auto for balanced perspective corrections; Level, which applies a level correction; Vertical, which applies level and perspective corrections, or Full, which applies, level, vertical, and horizontal corrections.
2 VERTICAL AND HORIZONTAL
If you find yourself needing to take more control, click on the Manual Transformations panel, and adjust the Vertical slider to straighten distorted vertical lines. You can also drag the Horizontal slider in order to correct distortion in the horizontal plane.
3 GUIDED MODE
For architectural shots that have defined straight lines, an easy way to make sure that your lines are straight is to click on the Guided mode. After this, draw at…