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diff --git a/matlab/tools/overlayImage.m b/matlab/tools/overlayImage.m
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+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));