Unfortunately I don't know of a way to save a P5 procedural.. Except... hmm.. perhaps apply it to the background node (or a square) and render that in a large resolution, then simply use that render, saved as a jpg? I dunno if it would work, but in theory it should.

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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.