samer@47: function D=contrast(C,s)
samer@47: % contrast(C,s)
samer@47: % adjust contrast of colourmap - moves all 
samer@47: % colours towards a medium grey.
samer@47: % C - colourmap (N by 3 matrix)
samer@47: % s - contrast: 1 no change, 0 completely grey
samer@47: 
samer@47: D=s*C + (1-s)*0.5*ones(size(C));
samer@47: 
samer@47: 
samer@47: 
samer@47: