To straighten perspective in Photoshop, use the Perspective Crop Tool or the Perspective Warp feature. Here's how:
Using the Perspective Crop Tool:
- Select the Perspective Crop Tool (located with the Crop Tool).
- Draw a marquee around the area you want to straighten. The tool automatically creates a grid that you can adjust.
- Drag the corners of the grid to align them with the edges of the object or area that should be rectangular. Aim to correct converging lines.
- Press Enter or click the checkmark in the Options bar to apply the crop and correct the perspective. Photoshop will resample and transform the image based on your adjustments.
Using Perspective Warp:
- Go to Edit > Perspective Warp.
- Photoshop initially provides a grid system. If you don't see it, click anywhere inside the image. You’ll create a quad.
- Drag the corners of the quad to align it with a plane in your image. Repeat to create quads for all the planes you want to adjust. It is useful to align the edges of the quads to the edges in the image.
- Once the quads are set up, switch from Layout mode to Warp mode in the options bar.
- Now you can manipulate the perspective. You can:
- Manually drag the corners of the quads to adjust the perspective.
- Use the automatic buttons in the options bar to:
- Level the horizontal lines in your grid.
- Straighten the vertical lines.
- Do both at once.
- Press Enter or click the checkmark in the Options bar to commit the changes.
Key Considerations:
- Image Resolution: Correcting perspective often involves stretching and resampling the image. Starting with a high-resolution image will minimize quality loss.
- Subtlety: Don't overdo the adjustments. Subtle corrections often look more natural than extreme transformations.
- Experimentation: Practice with both tools to determine which works best for different types of images and perspective issues. The Perspective Crop Tool is generally simpler for basic corrections, while Perspective Warp offers more control for complex scenes.
