Board Thread:Questions and Answers/@comment-26572643-20151125140115/@comment-27304891-20151204002053

I never realy knew there was a JD community up untill recently, but the "extractors" are really idiots. They think keeping this a thing that shouldn't be talked about in public so they feel like they're amazing when they make bad mashups to a terrible mspaint background.

/rant

Anyhoo, back to the question. Assuming you're talking about the black and white portion that you see in some videos, those are basicly used to take dancer out of the video with the dancer and added on top of the background. The lighter colors are more transparent (white being completely) and darker colors are more solid (black being completely. Think of it like a cutout on peice of paper, the white is the peice that was "cut out".

Now, "masking" them is a weird question. Do you want a screenshot or to make a mashup?