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    $\begingroup$ Clever! I always forget that such problems can be solved by image processing tricks. $\endgroup$ Commented Jun 29, 2012 at 22:00
  • $\begingroup$ @IstvánZachar but it's less effective than your fallback method, and the boundary is ugly OTL $\endgroup$ Commented Jun 29, 2012 at 22:13
  • $\begingroup$ Definitely the best method (+1). $\endgroup$ Commented Jun 29, 2012 at 23:10