Help with resolution of wallpaper?

[xtriickster]

Hi, I am currently working on my first theme with a friend of mine, King Shady, and am looking for some help on the background. I have a basic concept of photoshop and the the actual resolution needed for the wallpaper 320 by 480 but i am wondering why my wallpapers look fuzzy while applied to my iphone. Runing a 3G on 3.13 jailbroken with spirit. Thanks for any help.

EDIT: Sorry for being a little unclear about what my problem was. I realized that the creating i was doing in photoshop was not up to par and that a little more excursion into the tools can help. Sorry for the trouble!