Here is an intersting challange I was assigned:

Received a photo picture of a group of people posing for a picture. I
need to show another B&W trace of the edges of each person, number
each one so that we could assign a specific name to each one.

A similar technique has been used in The New York Times - Magazine...

I tried to do that with the magic wand, but wasn't able to get an
outline drwaing ONLY....

Ciould anyone have a suggestion please ?