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diff --git a/src/core/Lut1DOp.h b/src/core/Lut1DOp.h
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+/*
+Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
+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 Sony Pictures Imageworks 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_OCIO_LUT1DOP_H
+#define INCLUDED_OCIO_LUT1DOP_H
+
+#include <OpenColorIO/OpenColorIO.h>
+
+#include "Mutex.h"
+#include "Op.h"
+
+#include <vector>
+
+OCIO_NAMESPACE_ENTER
+{
+    // TODO: turn into a class instead of a struct?
+    
+    enum ErrorType
+    {
+        ERROR_ABSOLUTE = 1,
+        ERROR_RELATIVE
+    };
+    
+    
+    struct Lut1D;
+    typedef OCIO_SHARED_PTR<Lut1D> Lut1DRcPtr;
+    
+    struct Lut1D
+    {
+        static Lut1DRcPtr Create();
+        
+        // This will compute the cacheid, and also
+        // determine if the lut is a no-op.
+        // If this lut is being read in from float ASCII text
+        // a value of 1e-5 is preferable.
+        // If this lut is being read in from integer ASCII
+        // representation, the value will depend on the LSB
+        // at the specified integer precision.
+        // Example: reading 10-bit ints? Use 2/1023.0
+        // If you dont want to do the noop computation,
+        // specify a 0.0 tolerance.
+        //
+        // TODO: Instead of having each user compute the error
+        // individually, maybe they should specify the original file bitdepth?
+        // (with appropriate precision tokens?)
+        float maxerror;
+        ErrorType errortype;
+        
+        float from_min[3];
+        float from_max[3];
+        
+        typedef std::vector<float> fv_t;
+        fv_t luts[3];
+        
+        std::string getCacheID() const;
+        bool isNoOp() const;
+        
+        void unfinalize();
+    private:
+        Lut1D();
+        
+        mutable std::string m_cacheID;
+        mutable bool m_isNoOp;
+        mutable Mutex m_mutex;
+        
+        void finalize() const;
+    };
+    
+    typedef OCIO_SHARED_PTR<Lut1D> Lut1DRcPtr;
+    
+    // This generates an identity 1d lut, from 0.0 to 1.0
+    void GenerateIdentityLut1D(float* img, int numElements, int numChannels);
+    
+    void CreateLut1DOp(OpRcPtrVec & ops,
+                       const Lut1DRcPtr & lut,
+                       Interpolation interpolation,
+                       TransformDirection direction);
+}
+OCIO_NAMESPACE_EXIT
+
+#endif