I have an eyebrow transmap (very simple map that I created). I used blurring to smooth the values between sharp black and white.

Here is my material set-up for my eyebrows (actually, all of my hair).

I'm not sure where I would apply my transmap, or how because I haven't gotten that deep into nodes. Some nodes are very simple to understand, while others are not.

Normally, as I said before, I would apply a weight map to control the fiber growth; but the Hair room doesn't appear to have any method for doing that.

How would I apply my image transmap to my current eyebrow material to get the result I am looking for?