PSP best wallpaper resolution??

[necromancer1]

I want to put some of my favorite PC wallpapers on my PSP, but there 1600 1200, so they get cut off at the sides, what exacty is the screens max resolution in wallpaper size??

ect 1024*768
1600*1200

thanks

[Random]

The PSP's screen resolution is 480 x 272.