Fairytale Scene - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 444

Figure 9.42
11. In the options at the top of the screen, choose Pixels from the menu on the far left.
In the Custom Shape menu, choose the 3x3 grid ( Figure 9.43 ) .
Figure 9.43
12. Drag the grid onto the left side of the picture, and then go to Edit > Transform >
Perspective. Click the lower-left transform handle, drag upward ( Figure 9.44 ) , and
press Return/Enter.