It's been a while since you asked this question, but I'm gonna try to answer it anyway: I think this is due to your image view being 300 points in size, and your image being 300 pixels wide. Points =/= Pixels on iOS. For Example, on standard Retina displays 1pt == 2 pixels. To get the full resolution, youd have to multiply the amount of points you want by the displayScale property of your view's traitCollection. That way you get the correct amount of pixels so that your image does not look blurry on retina displays.