As was mentioned earlier in 60137, there is no anti-aliasing in raster image export. Such functionality is rather unusable!
Rephrased summary.
Confirmed. Win 7 64-bit Version: 4.4.0.0.alpha1+ Build ID: 56019dcb79475606952a954fe732a3109441ffec TinderBox: Win-x86@39, Branch:master, Time: 2014-10-30_07:27:11
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