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2013-11-02 03:27:48 -0500 answered a question Python. Simple image Face Detection using OpenCV

There's no needed for grayscale images. Only thing you needed to do is, be sure "haarcascade_frontalface_alt2.xml" file nearby your source code directory. If not write the whole path to it.

Ps.: you may cheat from .../opencv-(version)/data/haarcascades/haarcascade_frontalface_alt2.xml