Place a 1 pixel transparent boarder around the edge to force GS into anti-aliasing the edges.So basically in Photoshop (or whatever program you are using) shrink your actor down to 63x63 on a 64x64 canvas.(ignore the 2 pixel recommendation in my illustration, it only needs to be 1 pixel !!)
The actor should probably be 62x62 on a 64x64 canvas to get a 1 pixel transparent border all around the actor.
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