How to save CLUTO results in GIF Format

Hi,I am trying to save Matrix and Clutster images in GIF format and it is producing an empty GIF emage with no content.For given demo data matrix genes2 I am giving fallowing cammand.

vcluster -sim=corr -clmethod=agglo -clustercolumns -zeroblack -plotformat=gif -plotmatrix=fig6.gif genes2.mat 6

I tried many cammands but nothing is working. Is this problem is related to gCLUTO where currently there is no image saving option.