Images have jagged edges when rotated in Keynote 6.1

After upgrading to Keynote 6.1, I'm having problems when rotating images that I've imported to my slides. Any time I rotate an image that's not on a 45, 90, 180 angle, the image has jagged edges.
Here's a screenshot as an example. The image is on 4 degree angle.
Any ideas?

Sorry, in haste I forgot to mention this also:
Use an appropriate slide size, as a minimum resolution I match the slide size (Keynote > Inspector > Setup Slide Size), to the resolution of the display I am using, in my case 1920 x 1200.
I always resize the images I bring into Keynote with the same pixel resolution as the slide size.

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ryanroy.roy wrote:
I've have this problem a lot but I guess I'm just now getting around to ask about it.
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Message was edited by:
MatthewH

I've found that a lot of game development seems to involve working out exactly what you can get away with in terms of display rather than conforming to a strict model. Sure, this is changing these days, but in terms of a bitmapped sprite just how much difference will each incremement make when projected onto pixels?
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