Index: color.module
===================================================================
--- color.module	(revision 720)
+++ color.module	(working copy)
@@ -370,7 +370,7 @@
   // Render gradient.
   for ($y = 0; $y < $info['gradient'][3]; ++$y) {
     $color = _color_blend($target, $palette['top'], $palette['bottom'], $y / ($info['gradient'][3] - 1));
-    imagefilledrectangle($target, $info['gradient'][0], $info['gradient'][1] + $y, $info['gradient'][2], $info['gradient'][1] + $y + 1, $color);
+    imagefilledrectangle($target, $info['gradient'][0], $info['gradient'][1] + $y, $info['gradient'][0] + $info['gradient'][2], $info['gradient'][1] + $y + 1, $color);
   }
 
   // Blend over template.