What format do you initially save your picture in, before editing in Photoshop? Choose tif or BMP instead of for instance jpg or png which are compressed formats. If you choose bmp you will get exactely the same quality as in Poser it self.

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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.