I have been using Bagginsbill's advice on how to attach an image to a 1-sided square to create a background. But the image always renders slightly blurry compared to if the image is just imported as a background or pasted in with photoshop. I need to have the image on the square so that it will show up in a water reflection.

Anybody know how to make the image on the 1-sided square sharp in the materials room?