Crop- The image area to be cropped is selected by left-clicking the top-left crop point on the image and dragging the mouse to the bottom-right corner of the area to be kept.

If the image is larger than the view area, it is easier to fit the image in the window, (click the Fit button in Viewing Controls ), prior to selecting the crop area.

On - Check to apply the selected crop area to the displayed image.

Note: The values shown in the boxes are relative coordinates for the crop area and cannot be changed.