When you’re working on your pixel-perfect artwork in Photoshop, some common functions like moving, rotating and pasting can undo your hard work, resulting in a blurry mess. In fact, if you’re not careful, rotating layers in Photoshop can damage them in a very noticeable, pixel-mashing way – as illustrated below. But with some small changes to your workflow, you should be able to maintain the highest-quality artwork from the start to the end of the project.

Marc Edwards at Smashing Magazine has a great pixel perfection tutorial outlining a few methods that most designers are unaware of that avoids the problem.

One of the easiest solutions that I’ve used for years is to simply change the rotation orientation to the top left axis when rotating objects.