I had an issue today where an image (A .png at 72 DPI with transparency, inside an NSImageView — if that makes any difference) in a window was blurry. The image was perfectly sharp in Interface Builder’s library panel, but when I placed it in a window, it turned blurry. Maddening!
A (mysterious) workaround: put the image where you want it. Then move it, then hit undo. When it snaps back to where you want it, it should be sharp.
I have absolutely no idea why this worked, or why the images were blurred by Interface Builder/XCode in the first place. (And yes, the images were blurry when the application was built and run. It wasn’t just a display bug in Interface Builder). It was purely coincidence that I stumbled across this “solution”.