Attached Link: http://www.senosoft.com/

Poser 5 doesn't handle backgrounds in the same way. Your best bet is to export the image as a .png and then change anything in Photoshop or PSP that you like, then just save out as a .png. If you need to make .rsr files (for compatibility with P4), you can use P3Do Explorer (attached link) to generate these from the .pngs.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire