Alfred this is not foor loopable portrait wallpapers but just normal wallpaers in portrait for instance if you have a picture of megan fox in 480 x 800 which is a portrait image full size fits n900 screen in portrait now if you rry to set this normally you would not get full picture on desktop but just a zoomed in picture which would most probably cut the original pictures top and bottom out and you can only see the middle bit on the screen! So the above method avoids this from happening!