peaks colormap(hot(8)) hot(8) plot(hot) rgbplot(hot) colormap(hot(64)) rgbplot(hot) rgbplot(gray) new_gray = brighten(gray,0.5); rgbplot(new_gray) colormap(gray) peaks colormap(new_gray) pcolor([1:17;1:17]') title('Default Color Range') colormap(hsv(8)) colorbar title('Extended Color Range') caxis([-3 23]) colorbar title('Restricted Color Range') caxis([5 12]) colorbar caxis('auto') colorbar hadamard_demo