Adobe Photoshop has included Content Aware Scaling as a tool since the release of Photoshop CS4 on October 15th, 2008. The main principle of content aware scaling is applying an algorthm to an image to detect paths of least importance. This paths can be deleted or added to change the image size without changing the important parts.
On August 21st, 2007, youtuber and businessman Siim Teller uploaded a demo video offering a step-by-step instruction of the process
Curated from Image resize – YouTube