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http://www.pcmag.com/article2/0,2817,2372205,00.asp
Kinect works with people of all skin tones. And just like a camera, optimal lighting is best. Anyone experiencing issues with facial recognition should adjust their lighting settings, as instructed in the Kinect Tuner," the company said.
Here at PCMag we can corroborate: Our African-American reviewer gave the Kinect a 4-out-of-5-star review and an Editors' Choice award. In the tests for our Microsoft Kinect review, we had no facial-recognition problems. In fact, the system's impeccable recognition and motion-control abilities were a major contributor to our positive review."
Even Microsoft aren't evil/incompetent enough to release a machine that black people can't use.
Though if it didn't work for black people it would pretty much be racist. Can't blame science for bad craftsmanship. Like saying "I'm not racist, the sign factory had a discount today which meant if you buy a "No dogs allowed" sign you got a "No blacks" sign half-price. So I really had no choice but to ban blacks from my shop. Can't blame me, just economics.