Using Matlab R2015b with OpenGL rendering, I am trying to superimpose two pseudocolor images associated with different colormaps. Both images correspond to matrices displayed using imagesc. The commands are the following:
% Examples of matrices x=linspace(-7,7,200);y=x;[X,Y]=meshgrid(x,y);Z1=(X.^2+Y.^2).*exp(-(X.^2+Y.^2)/3^2);Z2=exp(-X.^2-Y.^2);
% New figure
hf=figure;
% Background image
h1 = axes;colormap(h1,'parula');p1=imagesc(x,y,Z1);set(h1,'ydir','normal');
% Foreground image
h2=axes;set(h2,'color','none','visible','off');colormap(h2,'jet');p2=imagesc(x,y,Z2,'alphadata',Z2>1e-2);set(h2,'ydir','normal');linkaxes([h1 h2])
I would like to display only the central part of the (Gaussian) matrix Z2, hence the transparency applied to its wings (with values < 1e-2). Doing so, the foreground image indeed gets paler, yet remains opaque to the background image. Actually, it remains opaque to the latter even by setting full transparency, i.e., set(p2,'alphadata',0)!
Consequently, I wonder whether it is possible at all to overlay pseudocolor images.
Thank you for your help.
