> For example, a lot of computer graphics algorithms like face recognition don't work well for black faces. There's probably less contrast to be used in edge d

> For example, a lot of computer graphics algorithms like face recognition don't work well for black faces. There's probably less contrast to be used in edge detection. > Even more troublesome, many cameras (both digital and film) have a dynamic range that works well for white faces, but poorly for black faces. The dynamic range is limited by objective factors and the automated exposure setting takes into consideration what gets more pixels in the frame - usually not a human face.