- On the ribbon, click
Raster Tools tab
Edit panel
Crop drop-down menu
Diagonal Region.
- Select a starting point for the diagonal crop region. This point can be any corner of the area that you want to preserve.
- Select a second point to define one of the edges of the area you want to preserve.
A bounding parallelogram is displayed to help you select the next point.
- Select the third point to complete the selection of the diagonal crop region.