Yes. Like a filter or a lens.

You've never seen my artistic lens thread?

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2754029

In that I discuss the use of a square to mediate what gets rendered. Using it, you can alter the output of the render, like postwork, but directly in Poser. That means you can convert to gray scale, do exposure compensation, gamma correction or tone mapping, special effects of all sorts, etc.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)