Damn this is cool. It's kinda amazing that it is all done in a few hundred lines of code. I see there is a skinColor method and setting defined as
skinColor: [0.78, 0.57, 0.44]
I was curious how it worked with darker skin (I admittedly don't understand what the numbers mean without further analysis), and It came out pretty well (it may default on lighter skin, i don't know)
Almost all skin colors, e.g. black and white, have the same chroma. Only the brightness changes. I have worked on video projects that took advantage of this to have skin-color auto-adjustment.
http://imgur.com/a/CKUIo
images found on google
I was curious how it worked with darker skin (I admittedly don't understand what the numbers mean without further analysis), and It came out pretty well (it may default on lighter skin, i don't know)