samer@47: function L=luminocity(C)
samer@47: % luminocity - Compute perceived brightness of colours
samer@47: %
samer@47: % luminocity :: [[N,3]] -> [[N]].
samer@47: 
samer@47: if size(C,2)~=3 && size(C,1)==3, C=C'; end
samer@47: L=C*[.298936021 .58704307445 .114020904255]';