help with importing heightmap into ck

[iakamil]

i created a heightmap in l3dt. this is what it looks like

 

http://i1051.photobucket.com/albums/s424/yourownstupidity/summersetisle.jpg

 

i used this command in tesannwyn:

TESAnnwyn -i Skyrim -s 20 -w SummersetIsle -x -32 -y -32 summersetisle.bmp

 

when i load up the esp in the ck, it looks like this

http://i1051.photobucket.com/albums/s424/yourownstupidity/screen.png

 

what did i do wrong?