Basing your black-white decision off of luma works pretty well for me. Luma is a weighted sum of the R, G, and B values, adjusted for human perception of relative brightness, apparently common in video applications. The official definition of luma has changed over time, with different weightings; see here: http://en.wikipedia.org/wiki/Luma_(video). I got the best results using the Rec. 709 version
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