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diff --git a/src/transfer_function.h b/src/transfer_function.h
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+++ b/src/transfer_function.h
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+/*
+    Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
+
+    This program 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 program 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 program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef LIBDCP_TRANSFER_FUNCTION_H
+#define LIBDCP_TRANSFER_FUNCTION_H
+
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <map>
+
+namespace dcp {
+
+class TransferFunction : public boost::noncopyable
+{
+public:
+	virtual ~TransferFunction ();
+
+	float const * lut (int bit_depth) const;
+
+	virtual bool about_equal (boost::shared_ptr<const TransferFunction> other, float epsilon) const = 0;
+
+protected:
+	virtual float * make_lut (int bit_depth) const = 0;
+
+private:	
+	mutable std::map<int, float*> _luts;
+};
+
+}
+
+#endif