In most all real-world textures, anything other than absolutle flat colors maps with only a couple of colors, JPEGs are going to be far smaller than GIFs. For these maps BMP (which is fully supported by Poser, I think) would be about as good too. I doubt if Poser suppers the transparency part of the GIF spec, too, I'm sure it doesn't support the mutiple image overlays... ;-) (I was actually involved with developing the GIF 1989 spec, with the Compserve Graphics Forums, seems like yesterday, too)