function im = overlayImage(reconstruction, ground_truth)
%------------------------------------------------------------------------
% im = overlayImage(reconstruction, ground_truth)
% 
% Produces an overlay image of two images, useful for image comparison.
%
% reconstruction: first input image matrix.
% ground_truth: second input image matrix.
% im: output 3-component image, third channel is 0.
%------------------------------------------------------------------------
%------------------------------------------------------------------------
% This file is part of the
% All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA-Toolbox")
%
% Copyright: iMinds-Vision Lab, University of Antwerp
% License: Open Source under GPLv3
% Contact: mailto:astra@ua.ac.be
% Website: http://astra.ua.ac.be
%------------------------------------------------------------------------
% $Id$

im(:,:,1) = reconstruction ./ max(reconstruction(:));
im(:,:,2) = ground_truth ./ max(ground_truth(:));
im(:,:,3) = zeros(size(reconstruction));