diff --git a/common/rfb/TrueColourMap.h b/common/rfb/TrueColourMap.h
new file mode 100644
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--- /dev/null
+++ b/common/rfb/TrueColourMap.h
@@ -0,0 +1,42 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This 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 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software 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 this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+#ifndef __RFB_TRUECOLOURMAP_H__
+#define __RFB_TRUECOLOURMAP_H__
+
+#include <rfb/ColourMap.h>
+
+namespace rfb {
+
+  class TrueColourMap : public ColourMap {
+  public:
+    TrueColourMap(const PixelFormat& pf_) : pf(pf_) {}
+
+    virtual void lookup(int i, int* r, int* g, int* b)
+    {
+      *r = (((i >> pf.redShift  ) & pf.redMax)
+            * 65535 + pf.redMax/2) / pf.redMax;
+      *g = (((i >> pf.greenShift) & pf.greenMax)
+            * 65535 + pf.greenMax/2) / pf.greenMax;
+      *b = (((i >> pf.blueShift) & pf.blueMax)
+            * 65535 + pf.blueMax/2) / pf.blueMax;
+    }
+  private:
+    PixelFormat pf;
+  };
+}
+#endif