To Remove Raster Data Outside a Diagonal Region

1. Click Raster menu CropDiagonal Region.
2. Select a starting point for the diagonal crop region. This point can be any corner of the area that you want to preserve.
3. 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.

4. Select the third point to complete the selection of the diagonal crop region.