how to compare two variances of two RGB image

i calculate for each image its variance like below:

for i=1:3
   Var(i) = var(reshape(im1(:,:,i),[],1));
end

how can i then compare the two variances to find wich image have max variance?

[Walter Roberson]

That code is giving you three variances for each image, which does not allow you to decide which image has the maximum variance.