Just like they do with black cats, dark clothing, lack of lighting. Dark colors absorb light, light colors reflect light. It is the reflection of light on a sur

Just like they do with black cats, dark clothing, lack of lighting. Dark colors absorb light, light colors reflect light. It is the reflection of light on a surface that gives it definition. I had a black cat that was nearly impossible to get spontaneous pictures of and I take night photography. Darkness requires more exposure time which equates to standing still longer. Facial recognition grabs people moving around in whatever lighting is available. It will inherently do better on lighter colors and contrasts just like the human eye does. Why do burglars and stage hands wear all black? So that they are harder to see.