Use the Adjust Selection window to crop a captured image. After you designate the area of a captured image, use the Adjust Selection window to crop the area in pixel-level increments.
You can use the Adjust Selection window to move a selection by clicking a directional arrow. When you click a directional arrow, you change the side of a selection rectangle one pixel with each mouse click.
When you hold down a directional arrow, the selection rectangle resizes steadily until you release the mouse button.