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+function Im = imreadgs(filename)
+
+%------------------------------------------------------------------------
+% Im = imreadgs(filename)
+%
+% Reads an image and transforms it into a grayscale image consisting of
+% doubles.
+%
+% filename: name of the image file.
+% Im: a grayscale image in double.
+%------------------------------------------------------------------------
+%------------------------------------------------------------------------
+% 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 = double(imread(filename));
+if size(Im,3) > 1
+ Im = Im(:,:,1);
+end