Of course I could just do it in Photoshop, but I'd like a way to do it in Poser and I know it's possible.. Just can't wrap my mind arooound the "how"

Here's the deal: I have a shirt texture where the buttons are made with displacement. So I have a displacement map for them. But I'd also like the buttons to not be coloured, in fact i'd like them to be white... So I thought if I used the inverted displacement map in the Diffuse Value, it would then put the Diffuse Colour in its pure form on those buttons - right?

Or am I wayy off?

Here's the mat setup for now:

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.