Dear folks, I'm working on a card game w/ cocos 2d 0.99.0 and have sprites coming from both a sprite sheet as well as individual png files. I'm using the rotation property of the sprites, however this leads to awful rough edges as you can see here:

It looks almost as if there's no antialiasing applied.
While trying to debug this, I added a small transparent border around the image and suddenly everything looked as I would expect; see here:

I don't quite understand why it looks ok in that case.
Do you have any idea how I can fix that rather than working around by adjusting the sprites?