Mesh Warp is designed for sources with local deformation – for example warped, folded or unevenly distorted drawings and photographs.
When to use Mesh Warp
Standard perspective correction addresses global projective distortion of the entire plane. Mesh Warp is appropriate when different parts of the image require different local corrections.
Working grid
Choose the number of rows and columns to create a grid of control points. Moving these points adjusts the local geometry of the source.
Helper lines and crosses can be used as snapping references when positioning grid points.
Recommendation: Use the simplest grid that reliably corrects the deformation. An unnecessarily dense grid makes the result harder to check.