wallpaper setting..nexus one

[suprtong]

im trying to set a picture in my gallery as a wallpaper on my nexus one 2.2 froyo.. when i view the picture in my gallery its fine but i goto set as wallpaper it wants me to crop the picture which doesnt allow me to use the entire picture.. is there a seting that will allow this? its a picture i downloaded off my pc but it does the same thing even if i take a picture with my camera.. and i cant for the life of me figure out what im doing wrong or what setting i may possibly be missing, thanks