hello
this is the way I control the Z scale rendering of imagesc :
A = rand(100,100);
figure(1);imagesc(A);colorbar('vert');
% let's say we don't want to display values below "lower_limit" and above "upper_limit"
lower_limit = 0.75;
upper_limit = 0.9;
A(A<lower_limit) = lower_limit; % or NaN
A(A>upper_limit) = upper_limit; % or NaN
figure(2);imagesc(A);colorbar('vert');
