Content aware scale is not so much about resizing an image as much as it is about extending an image. It allows you to stretch the existing pixels along a single axis without distorting (or with less distorting) of the subject or subjects of the image.
In this first photo is the original and the area that needs to be filled with image data to the right.
In this 2nd image I just scaled the image up to fill. As you can see, I've lost a lot of the image as I'm basically cropping it as I scale it up along both the x axis and the y axis.
If I try to just scale the image along the x-axis the image will distort. The ship and the bathers get wider.
In this 4th image I've used content aware scale to "pull" the pixels over only along the x axis. Notice that the ship and the swimmers retain their original appearance.
Hope that helps
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