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diff --git a/src/libs/histogram/imagehistogram.h b/src/libs/histogram/imagehistogram.h
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2004-07-21
+ * Description : image histogram manipulation methods.
+ *
+ * Copyright (C) 2004-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
+ *
+ * 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, 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.
+ *
+ * ============================================================ */
+
+
+#ifndef IMAGEHISTOGRAM_H
+#define IMAGEHISTOGRAM_H
+
+// TQt includes.
+
+#include <tqthread.h>
+
+// Local includes.
+
+#include "digikam_export.h"
+
+class TQObject;
+
+namespace Digikam
+{
+
+class ImageHistogramPriv;
+class DImg;
+
+class DIGIKAM_EXPORT ImageHistogram : public TQThread
+{
+
+public:
+
+enum HistogramChannelType
+{
+    ValueChannel = 0,
+    RedChannel,
+    GreenChannel,
+    BlueChannel,
+    AlphaChannel
+};
+
+class EventData
+{
+public:
+
+    EventData() 
+    {
+       starting  = false;
+       success   = false;
+       histogram = 0;
+    }
+
+    bool            starting;
+    bool            success;
+    ImageHistogram *histogram;
+};
+
+public:
+
+    ImageHistogram(uchar *i_data, uint i_w, uint i_h, bool i_sixteenBits, TQObject *parent=0);
+
+    ImageHistogram(const DImg& image, TQObject *parent=0);
+    ~ImageHistogram();
+
+    void setup(uchar *i_data, uint i_w, uint i_h, bool i_sixteenBits, TQObject *parent);
+
+    /** Method to stop threaded computations.*/
+    void stopCalcHistogramValues(void);
+
+    /** Methods for to manipulate the histogram data.*/
+    double getCount(int channel, int start, int end);
+    double getMean(int channel, int start, int end);
+    double getPixels();
+    double getStdDev(int channel, int start, int end);
+    double getValue(int channel, int bin);
+    double getMaximum(int channel);
+
+    int    getHistogramSegment(void);
+    int    getMedian(int channel, int start, int end);
+
+private:
+
+    ImageHistogramPriv* d;
+    
+private:
+
+    void calcHistogramValues();
+    void postProgress(bool starting, bool success);
+
+protected:
+
+    virtual void run();
+};
+
+}  // NameSpace Digikam
+
+#endif /* IMAGEHISTOGRAM_H */