Distorting an Image
Photoshop CS6 Tutorial
How to Distort an Image in Photoshop
Often times with architectural images you want the vertical lines of the building to be vertical. By distorting the image, you can quickly pull a wall back into place.
Another great way to fix this problem is the Lens Correction filter. For more info, see topic Lens Correcting an Image.
Open an architectural image in Photoshop (File > Open...).
Drag from the rulers to the workspace to add a few vertical guides. If the rulers are not visible, choose View > Rulers.
Select the entire image, Select > All (Cmd/a (PC-Ctrl/a)).
Choose Edit > Transform > Distort and move the corner points to distort the image and align the vertical objects with the guides.
To keep the points from snapping to the corners, press and hold the Ctrl key while moving the corner.
Press Enter to apply the changes.