256x256 pictures devided by two ends up blurry on the edges. Why?

nypraise

I have some pictures that are 256x256 (that looks good) that I have devided by two, 128x128, and imported to my scene. But when in the scene the picture ends up some what blurry on the edges compared to what it was on 256x256. What is wrong? Should´nt deviding something by two be okey?

The_Gamesalad_Guru

Retina display needs to be divisible by 4

nypraise

Both 256 and 128 is divisible by 4?

jonmulcahy

Make sure they are not located on a .5 pixel for their x and y location. Also, make sure they are 72dpi