% Example code to plot pixel values in a color cube. 
%   Note1:  mask is a binary image, in case we only care about some of the
%   pixels. Xs, Ys, Zs are images with the same size as the mask.
%   Note2:  Change 'rx' and use "hold on" to plot values, expressed in the
%   same color-space, for different objects in the same figure. 

index = find(mask);
plot3( Xs(index), Ys(index), Zs(index), 'rx' );

axis([0 1 0 1 0 1] );
axis on

set(get(gca,'XLabel'),'String','Red axis');
set(get(gca,'YLabel'),'String','Green axis');
set(get(gca,'ZLabel'),'String','Blue axis');

set(gca,'box','on')
set(gca,'XGrid','on')
set(gca,'YGrid','on')
set(gca,'ZGrid','on')