You can use the new cropping tool to trim an image or delete unwanted parts of an image. Cropping removes or masks areas of a picture by reducing the vertical and horizontal edges.
To crop an image:
Even after you crop parts of an image, the cropped parts remain as part of the initial picture file. Though, they are not visible on the slide. You can outcrop your image by dragging the cropping handles away from the center of the picture.