Poser 4 or 5? You CAN apply the background pic to a one sided square instead of importing it. That will enable you to resize it without any pixelation (within reasonable parameters of course)

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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.