>> Are you using anti-aliasing?
>
> I am, but the high contrast messes it up, unfortunately.

Although POV-Ray 3.6 tends to have aliasing problems on the edges of bright 
objects, the arrow of the exit sign has aliased edges but doesn't look too 
bright. I wonder if you just need to decrease the anti-aliasing threshold? 
If it's the 3.6 bright object problem, you could try rendering in version 
3.5 or just rendering an extra large image and scaling it down.

 - Slime
 [ http://www.slimeland.com/ ]

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