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diff --git a/src/libs/levels/imagelevels.h b/src/libs/levels/imagelevels.h
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2004-07-29
+ * Description : image levels manipulation methods.
+ *
+ * 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 IMAGELEVELS_H
+#define IMAGELEVELS_H
+
+#define CLAMP(x,l,u) ((x)<(l)?(l):((x)>(u)?(u):(x)))
+
+/*  Map RGB to intensity  */
+
+#define LEVELS_RGB_INTENSITY_RED    0.30
+#define LEVELS_RGB_INTENSITY_GREEN  0.59
+#define LEVELS_RGB_INTENSITY_BLUE   0.11
+#define LEVELS_RGB_INTENSITY(r,g,b) ((r) * LEVELS_RGB_INTENSITY_RED   + \
+                                     (g) * LEVELS_RGB_INTENSITY_GREEN + \
+                                     (b) * LEVELS_RGB_INTENSITY_BLUE)
+
+// KDE includes.
+
+#include <kurl.h>
+
+// Local includes.
+
+#include "dcolor.h"
+#include "digikam_export.h"
+
+namespace Digikam
+{
+
+class ImageLevelsPriv;
+class ImageHistogram;
+
+class DIGIKAM_EXPORT ImageLevels
+{
+
+public:
+
+    ImageLevels(bool sixteenBit);
+    ~ImageLevels();
+
+    bool   isDirty();
+    bool   isSixteenBits();
+    void   reset();
+
+    // Methods for to manipulate the levels data.
+
+    void   levelsChannelReset(int channel);
+    void   levelsAuto(ImageHistogram *hist);
+    void   levelsChannelAuto(ImageHistogram *hist, int channel);
+    int    levelsInputFromColor(int channel, const DColor& color);
+    void   levelsBlackToneAdjustByColors(int channel, const DColor& color);
+    void   levelsGrayToneAdjustByColors(int channel, const DColor& color);
+    void   levelsWhiteToneAdjustByColors(int channel, const DColor& color);
+    void   levelsCalculateTransfers();
+    float  levelsLutFunc(int n_channels, int channel, float value);
+    void   levelsLutSetup(int nchannels);
+    void   levelsLutProcess(uchar *srcPR, uchar *destPR, int w, int h);
+
+    // Methods for to set manually the levels values.
+
+    void   setLevelGammaValue(int Channel, double val);
+    void   setLevelLowInputValue(int Channel, int val);
+    void   setLevelHighInputValue(int Channel, int val);
+    void   setLevelLowOutputValue(int Channel, int val);
+    void   setLevelHighOutputValue(int Channel, int val);
+
+    double getLevelGammaValue(int Channel);
+    int    getLevelLowInputValue(int Channel);
+    int    getLevelHighInputValue(int Channel);
+    int    getLevelLowOutputValue(int Channel);
+    int    getLevelHighOutputValue(int Channel);
+
+    // Methods for to save/load the levels values to/from a Gimp levels text file.
+
+    bool   saveLevelsToGimpLevelsFile(const KURL& fileUrl);
+    bool   loadLevelsFromGimpLevelsFile(const KURL& fileUrl);
+
+private:
+
+    ImageLevelsPriv* d;
+};
+
+}  // NameSpace Digikam
+
+#endif /* IMAGELEVELS_H */