my head hurts .... all I know is that if you use a multiple of 16 for an image in Photoshop, you will get almost seamless textures with certain filters. What poser thinks about files that size? I have no flippin idea. I was told once by Kai that it has something to do with the base algorithm originally used when coding Photoshop .... but that conversation was a LONG time ago in a BBS far far away Since large texures eat memory it would be logical to use them on a) large objects and b) important (close to camera) objects. Why large ones? well you have more pixels to spread around that way ...if you use a low res image on a large object it gets fuzzy and looks bad.