Quote - Acadia - .PSD is good, but it still a Compressed format.  Window's native .BMP is the best(most raw) format, to archive your images.   I would think it would be best to save, from Poser, as .BMP; and then let  the newest version of Photoshop create your  .PSDs for you.

A .bmp file has a background when taken into a graphic program.  An image rendered without a background and saved in .png, or .psd format will not have a background when opened in a graphic program.  They are also considered "lossless" formats meaning that the quality of the image is not lost when saved in tha format.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi