Board Thread:LotR Mod Technical Support/@comment-28290128-20180313044057

so i'm trying to customize the map.png file to add a texture for custom faction lands but where i'm trying to add it is half off the map so either my texture either gets cut off or it gets shifted over and is in the wrong spot. so what i was wondering is if anybody knew a way in GIMP to adjust map.png so that i can add my texture without it getting cut off or shifted over?

(sorry if this is in the wrong place i don't forum much) 