[Freesurfer] freeview: Creating and using a LUT with a single region

Hi,

I am trying to use a LUT which picks out just one region of the segmentation, e.g.:

$ cat HCOnlyColorLUT.txt #$Id: FreeSurferColorLUT.txt,v 1.70.2.7 2012/08/27 17:20:08 nicks Exp $

#No. Label Name: R G B A

0 Unknown 0 0 0 255 17 Left-Hippocampus 220 216 20 0

with which I expect the segmentation overlay to have only one yellow region corresponding to the left HC. I run the command line:

$ freeview -v T1.mgz aseg.mgz:colormap=lut:lut=HCOnlyColorLUT.txt

after which I am getting the overlay displayed as below. I must be doing something stupid, could you, please help me out?

Thanks

Tamás