Ionic framework ion-scroll pinch to zoom on iOS causes blurred images.

I have setup an ion-scroll tag with a background image, when running on iOS it appears to take a snapshot of it zoomed out and scroll that which results in blurred images.

I have tried swapping PNG for SVG but the same issue happens.

I have looked on the official forum and there seems to be no answer yet, so I wondered if there was a CSS rule I could use or whether there was an alternative angularjs directive I could use.