Using Perspective Warp
When working with photos of buildings, billboards, and other large objects, you may want to adjust the perspective (FIGURE 15.10). For this job, Photoshop provides the Perspective Warp command.
FIGURE 15.10 We’d like to fix this image so it looks like we’re viewing this café straight on instead of looking up and slightly askew.
With Perspective Warp, you can draw four-sided shapes called quads to define planes in your image, and then straighten them so their sides are perfectly horizontal or vertical.
Perspective Warp requires that a compatible graphics processor is enabled in Preferences: Choose Edit > Preferences > Performance (Windows) or Photoshop > Preferences > Performance (macOS), and then confirm that Use Graphics Processor is enabled in the Graphics Processor area of the dialog.
To change perspective in an image:
Choose Edit > Perspective Warp.
In Layout mode, drag to create a rectangular quad.
Drag the corners (pins) or sides of the quad so they match the sides of the object whose perspective you want to change (FIGURE 15.11).
FIGURE 15.11 Drag the pins or sides of the quad as close as possible to the lines you want to make horizontal or vertical.
Switch to Warp mode by clicking the button in the Options bar (FIGURE 15.12).
FIGURE 15.12 You can tell you’re in Warp mode by three things: the Warp button in the Options bar is pressed, the pins turn black, and the grid lines inside the quad disappear.
Drag the pins on the quad to change the perspective in the image. You can also use the buttons in the Options bar to automatically straighten near vertical lines, level near horizontal lines, or both () (FIGURE 15.13).
FIGURE 15.13 The straightened image in Warp mode
To accept the result, Press Enter or click the Commit Perspective Warp button () (FIGURE 15.14). Or, to cancel and leave the image unchanged, press Esc or click the Cancel Perspective Warp button ().
FIGURE 15.14 The finished image with corrected perspective. Note the resulting transparent areas in the corners, which will need to be filled or cropped out.