“sips - scriptable image processing system. This tool is used to query or modify raster image files and ColorSync ICC profiles. Its functionality can also be used through the "Image Events" AppleScript suite.”

man 1 sips

Thanks for pointing it out

“EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.”

Mal schnell Dinge ohne High-DPI (i.e. „kein Retina“) testen? Mit diesem Tool lässt sich die Bildschirmauflösung direkt aus der Menu Bar einstellen. Kostenlos im Mac App Store.

EasyRes EasyRes