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diff --git a/digikam/imageplugins/adjustlevels/adjustlevels.h b/digikam/imageplugins/adjustlevels/adjustlevels.h
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2004-07-20
+ * Description : image histogram adjust levels. 
+ * 
+ * Copyright (C) 2004-2008 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 ADJUSTLEVELS_H
+#define ADJUSTLEVELS_H
+
+// Digikam includes.
+
+#include "imagedlgbase.h"
+#include "dimg.h"
+
+class QComboBox;
+class QSpinBox;
+class QPushButton;
+class QHButtonGroup;
+
+class KDoubleSpinBox;
+class KGradientSelector;
+class KDoubleNumInput;
+
+namespace Digikam
+{   
+class HistogramWidget;
+class ImageWidget;
+class ImageLevels;
+}
+
+namespace DigikamAdjustLevelsImagesPlugin
+{
+
+class AdjustLevelDialog : public Digikam::ImageDlgBase
+{
+    Q_OBJECT
+
+public:
+
+    AdjustLevelDialog(QWidget *parent);
+    ~AdjustLevelDialog();
+
+private:
+
+    void readUserSettings();
+    void writeUserSettings();
+    void resetValues();
+    void finalRendering(); 
+    void adjustSliders(int minIn, double gamIn, int maxIn, int minOut, int maxOut);
+    bool eventFilter(QObject *o, QEvent *e);
+    
+private slots:
+
+    void slotUser2();
+    void slotUser3();
+    void slotEffect();
+    void slotResetCurrentChannel();
+    void slotAutoLevels();
+    void slotChannelChanged(int channel);
+    void slotScaleChanged(int scale);
+    void slotAdjustSliders();
+    void slotGammaInputchanged(double val);
+    void slotAdjustMinInputSpinBox(int val);
+    void slotAdjustMaxInputSpinBox(int val);
+    void slotAdjustMinOutputSpinBox(int val);
+    void slotAdjustMaxOutputSpinBox(int val);
+    void slotSpotColorChanged(const Digikam::DColor &color);
+    void slotColorSelectedFromTarget(const Digikam::DColor &color);
+    void slotPickerColorButtonActived();    
+    void slotShowHistogramGuide(int v);
+
+private:
+    
+    enum HistogramScale
+    {
+        Linear=0,
+        Logarithmic
+    };
+    
+    enum ColorChannel
+    {
+        LuminosityChannel=0,
+        RedChannel,
+        GreenChannel,
+        BlueChannel,
+        AlphaChannel
+    };
+    
+    enum ColorPicker
+    {
+        BlackTonal=0,
+        GrayTonal,
+        WhiteTonal
+    };
+
+    uchar                     *m_destinationPreviewData;
+    
+    int                        m_histoSegments;
+    int                        m_currentPreviewMode;
+    
+    QComboBox                 *m_channelCB;    
+    
+    QSpinBox                  *m_minInput;
+    QSpinBox                  *m_maxInput;
+    QSpinBox                  *m_minOutput;
+    QSpinBox                  *m_maxOutput;
+    
+    QPushButton               *m_autoButton;
+    QPushButton               *m_resetButton;
+    QPushButton               *m_pickBlack;
+    QPushButton               *m_pickGray;
+    QPushButton               *m_pickWhite;
+    
+    QHButtonGroup             *m_pickerColorButtonGroup;
+    QHButtonGroup             *m_scaleBG;
+
+    KDoubleNumInput           *m_gammaInput;
+    
+    KGradientSelector         *m_hGradientMinInput;
+    KGradientSelector         *m_hGradientMaxInput;
+    KGradientSelector         *m_hGradientMinOutput;
+    KGradientSelector         *m_hGradientMaxOutput;
+    
+    Digikam::HistogramWidget  *m_levelsHistogramWidget;
+    Digikam::HistogramWidget  *m_histogramWidget;
+    
+    Digikam::ImageWidget      *m_previewWidget;
+    
+    Digikam::ImageLevels      *m_levels;
+    Digikam::DImg              m_originalImage;
+};
+
+}  // NameSpace DigikamAdjustLevelsImagesPlugin
+
+#endif /* ADJUSTLEVELS_H */