This is from a previous question:
Export your Poser render as a ".tif".
The following works with PSP 7, however I am not familiar with PSP8

The tiff will have an alpha plane for the transparency, in other words there is no background so they don't need to be extracted with a "magic wand", especially great with things like hair etc. However not all ".tiffs" have alpha planes.

To use them:
(1) Load the image.
(2) Then Menu/Selections/Load from Alpha Channel
(3) Then Menu/Edit/Copy
(4) Now you can do a number of things. Menu/Edit/Paste/As new image (a great way to export it as a tube) or As a new layer (great for compositing), plus a couple of others I don't normally use.
(5) Also look at the selection menu as there some other handy thing there as well like inverting the selecttion to make a mask.

The ".tiff" pictures with Alpha Planes can anything and it is very, very handy for trees and vegetation, see my gallery.

Poser can export ".tiffs" complete with an intact alpha plane which makes it very handy for compositing etc. Just have a look at some of the pics with lots of figures in them in my Renderosity Gallery. (Richard T)
http://www.renderosity.com/gallery.ez?ByArtist=Yes&Artist=Richard+T

Hope this helps.
Richard