This video of an image manipulation algorithm shown at SIGGRAPH is jaw-dropping. They calculate paths through an image that have low entropy and either delete or interpolate them, creating images that shrink or grow while not distorting the "interesting" elements. (via John Lam) Here's \<a href="http://www.faculty.idc.ac.il/arik/imret.pdf"" target="_blank" rel="noopener noreferrer">the paper from the conference.