I made a Photoshop action for making stuff into Lineart ages ago. I haven't tried it recently, I think it was made in the Photoshop 5 days - but you're welcome to try it out and see if it's of any use. You can download it HERE

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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.