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The technique is called Seam Carving: https://en.wikipedia.org/wiki/Seam_carving

It effectively eliminates the least interesting line when performing a resize, allowing you, for example, to resize a skyline by eliminating the uninteresting smaller buildings and gaps.




There's even an iOS app called Liquid Scale that will do this right on your iPhone.

http://www.savoysoftware.com/liquidscale/

There may be others but I haven't run across them.




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