Well, I was specifically thinking of killing the specular in Photoshop but I won't dispute if BB says Poser nodes are better.

I'll tell you my train of thought though.  Bear in mind I have no idea how to achieve it: it just seemed doable...

Extract the brightness information from an image and duplicate it.  Invert the duplicate and put it back somehow* with the original brightness.  This should have the effect of averaging it out.  Add back to the colour info.

 

• For the life of me I can't remember what the operation to do this is called.  It's a similar technique to killing off vocals in a music track, if the vocals are in the centre.  You reverse the phase of one channel.  The result causes a phase cancellation which (theoretically) kills anything in the centre of the mix.

Anyhow, so much for that.  As you were, guys and gals.  :) 

 

Coppula eam se non posit acceptera jocularum.

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