Dwight, if you export as a .tiff then it will carry an alpha channel. Go into PS or Photopaint or PSP, load the alpha channel and you will get your guy as a selection (in other words, you will get the transparent 'background'). You can then copy and paste him or whatever as a layer by itself and have the background behind it--easy to edit then. Be sure your Poser model is against a solid background before you save as a .tiff. White cloud?--hmm, I'd add a layer and use a brush fairly transparent--the effect will depend upon your brush and how you apply it. There are lots of other ways (filters, etc)--that's what came to mind immediately.