--- a/scripts/image/ind2gray.m	Wed Jan 11 02:56:01 1995 +0000
+++ b/scripts/image/ind2gray.m	Wed Jan 11 20:30:04 1995 +0000
@@ -1,22 +1,45 @@
-function Y = ind2gray(X,map)
+# Copyright (C) 1995 John W. Eaton
+# 
+# This file is part of Octave.
+# 
+# Octave is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2, or (at your option) any
+# later version.
+# 
+# Octave is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with Octave; see the file COPYING.  If not, write to the Free
+# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+function Y = ind2gray (X, map)
 
 # Convert an octave indexed image to a gray scale intensity image.
 #
-# Y = ind2gray(X) converts an indexed image to a gray scale intensity
+# Y = ind2gray (X) converts an indexed image to a gray scale intensity
 # image.  The current colormap is used to determine the intensities.
 # The intensity values lie between 0 and 1 inclusive.
 #
-# Y = ind2gray(X,map) uses the specified colormap instead of the current
-# one in the conversion process.
+# Y = ind2gray (X, map) uses the specified colormap instead of the
+# current one in the conversion process.
 #
 # SEE ALSO: gray2ind, rgb2ntsc, image, colormap
 
-  if (nargin == 1)
-    map = colormap;
+# Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
+
+  if (nargin < 1 || nargin > 2)
+    usage ("ind2gray (X, map)");
+  elseif (nargin == 1)
+    map = colormap ();
   endif
 
-  # Convert colormap to intensity values.
-  yiq = rgb2ntsc(map);
+# Convert colormap to intensity values.
+
+  yiq = rgb2ntsc (map);
   y = yiq(:,1);
 
 # We need Fortran indexing capability, but be sure to save the user's
@@ -31,9 +54,9 @@
 # Replace indices in the input matrix with indexed values in the output
 # matrix.
 
-    [rows, cols] = size(X);
+    [rows, cols] = size (X);
     Y = y(X(:));
-    Y = reshape(Y,rows,cols);
+    Y = reshape (Y, rows, cols);
 
   unwind_protect_cleanup
     do_fortran_indexing = pref;