--- a/scripts/image/ntsc2rgb.m
+++ b/scripts/image/ntsc2rgb.m
@@ -1,6 +1,34 @@
-function rgb = ntsc2rgb(yiq)
+# 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.
 
-  trans = [ 1. 1. 1.; 0.95617 -0.27269 -1.10374; 0.62143 -0.64681 1.70062 ];
+function rgb = ntsc2rgb (yiq)
+
+# Image format conversion.
+
+# Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
+
+  if (nargin != 1)
+    usage ("ntsc2rgb (yiq)");
+  endif
+
+  trans = [ 1.0,      1.0,      1.0;
+            0.95617, -0.27269, -1.10374;
+            0.62143, -0.64681, 1.70062 ];
 
   rgb = yiq * trans;