Crop Tool
Use the Crop & Skew tool to identify the area in which you want to work.
Working with a localized area is crucial for a good tiling experience. Use the crop tool to prepare the image before you start tiling.
Written by Sam Jenkins
Use the Skew feature to select the fabric repeat area
Skewing the selection area will compensate for minor wrinkles and deformations.
Written by Kenji Takabayashi