I rarely ever see GIFs used for texture or transparency maps. But for certain types of texturing, they seem to make more sense than JPGs, since 8-bit images seem to relieve a little of the processing and memory load for Poser. GIFs work fine with the Mac, but it seems I remember hearing that certain image formats don't work equally across platforms. GIF images would be perfect for grayscale tranparency maps and texture maps that are designed for spot color work (3 or 4 different basic colors with some gradient colors for anti-aliasing).