Photoshop's Content Aware Scale tool doesn't get much headline time thanks to other popular features like Content Aware Move and, of course, the vilified Liquify toll, but it can come in extremely handy in a few minutes.
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Consider this a form of after processing, turning that square shaped image into the landscape photo you wish it turned out to be in the first place. Can happen with the Liquify tool, and here is how you use it.