In the Camera Raw dialog
box, select the Crop tool .
To constrain your initial crop area to a specific aspect
ratio, hold the mouse button down as you select the Crop tool, and
choose an option from the menu.
Drag in the preview image to draw the crop area box.
Optional To move, scale, or rotate the
crop area, drag the crop area or its handles.
Click OK to crop the image.
Note: To cancel the crop operation, press Esc with the Crop
tool active, or click and hold the Crop tool button and choose Clear
Crop from the menu. To cancel the crop and close the Camera Raw
dialog box without processing the camera raw image file, click the
Cancel button or deselect the Crop tool and press Esc.