charlesw/tesseract — pull request #29 by tausten (2013-06-14 00:40:16+00:00)
Title: Add leptonica's pixConvertRGBToGray to the api, and expose via Pix

I've added support for the ConvertRGBToGray leptonica API call to the Pix class, following the Descew and OtsuBinarization examples, including an additional minimalistic unit test.