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diff --git a/Source/OpenEXR/IlmImf/ImfRational.h b/Source/OpenEXR/IlmImf/ImfRational.h
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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// *       Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// *       Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// *       Neither the name of Industrial Light & Magic nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+#ifndef INCLUDED_IMF_RATIONAL_H
+#define INCLUDED_IMF_RATIONAL_H
+
+//-----------------------------------------------------------------------------
+//
+//	Rational numbers
+//
+//	A rational number is represented as pair of integers, n and d.
+//	The value of of the rational number is
+// 
+//		n/d			for d > 0
+//		positive infinity	for n > 0, d == 0
+//		negative infinity	for n < 0, d == 0
+//		not a number (NaN)	for n == 0, d == 0
+//
+//-----------------------------------------------------------------------------
+
+namespace Imf {
+
+class Rational
+{
+  public:
+
+    int			n;		// numerator
+    unsigned int	d;		// denominator
+
+
+    //----------------------------------------
+    // Default constructor, sets value to zero
+    //----------------------------------------
+
+    Rational (): n (0), d (1) {}
+
+
+    //-------------------------------------
+    // Constructor, explicitly sets n and d
+    //-------------------------------------
+
+    Rational (int n, int d): n (n), d (d) {}
+
+
+    //----------------------------
+    // Constructor, approximates x
+    //----------------------------
+
+    explicit Rational (double x);
+
+
+    //---------------------------------
+    // Approximate conversion to double
+    //---------------------------------
+
+    operator double () const {return double (n) / double (d);}
+};
+
+} // namespace Imf
+
+#endif