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diff --git a/source/blender/compositor/operations/COM_DifferenceMatteOperation.h b/source/blender/compositor/operations/COM_DifferenceMatteOperation.h
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+++ b/source/blender/compositor/operations/COM_DifferenceMatteOperation.h
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+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor: 
+ *		Jeroen Bakker 
+ *		Monique Dewanchand
+ */
+
+#ifndef _COM_DifferenceMatteOperation_h
+#define _COM_DifferenceMatteOperation_h
+#include "COM_MixBaseOperation.h"
+
+
+/**
+  * this program converts an input colour to an output value.
+  * it assumes we are in sRGB colour space.
+  */
+class DifferenceMatteOperation : public NodeOperation {
+private:
+	NodeChroma* settings;
+	SocketReader * inputImage1Program;
+	SocketReader* inputImage2Program;
+public:
+	/**
+	  * Default constructor
+	  */
+	DifferenceMatteOperation();
+	
+	/**
+	  * the inner loop of this program
+	  */
+	void executePixel(float* color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]);
+	
+	void initExecution();
+	void deinitExecution();
+	
+	void setSettings(NodeChroma* nodeChroma) {this->settings= nodeChroma;}
+};
+#endif