iResizer

From TeoreX:

iResizer is a handy way to resizing images non uniformly while preserving the key features of the picture. iResizer avoiding distortion of the important parts of the image. It also can be used to remove portion of the image in a consistent way. For example, you can turn a landscape picture into a square picture and close up the space between people in an image if they are a long way apart. It also works in reverse and you can use it to make a photo larger. You can mark important elements in the image using green marker, this technique is handy if you have areas of the image that you want to retain at the expense of other areas and it can also be used to protect people in the image. Also you can use red marker to select which features of the image should be discarded.

View larger image