Content awarenes scaling allow you to stretch photos and the proportions of key aspects of the photo.
Two methods of scaling are provided since version 6. After protecting the areas you do not wish to distort, switch to the Content aware photo resize tool and prepare your photo. Then use the side handles to scale the photo. Hold down the Alt key when dragging the side handles to apply the alternative algorithm. An example of CAS in action is shown below.
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Enhance tool | Clip | Clone | Magic erase | Photo Healing tool | Red eye | Content aware scale | Content aware zoom | Levels | Panorama | Perspective correction | Exif | Opacity masks | Photo hue | Color erase/ selection | Background Erase | Photo Effects | Shadow & Highlight controls