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diff --git a/src/imageplugins/coreplugin/bcgtool.cpp b/src/imageplugins/coreplugin/bcgtool.cpp
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+++ b/src/imageplugins/coreplugin/bcgtool.cpp
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2004-06-05
+ * Description : digiKam image editor to adjust Brightness,
+                 Contrast, and Gamma of picture.
+ *
+ * Copyright (C) 2004 by Renchi Raju <[email protected]>
+ * Copyright (C) 2005-2008 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.
+ *
+ * ============================================================ */
+
+// TQt includes.
+
+#include <tqcheckbox.h>
+#include <tqcolor.h>
+#include <tqcombobox.h>
+#include <tqframe.h>
+#include <tqgroupbox.h>
+#include <tqhbuttongroup.h>
+#include <tqhgroupbox.h>
+#include <tqlabel.h>
+#include <tqlayout.h>
+#include <tqpushbutton.h>
+#include <tqtooltip.h>
+#include <tqvbox.h>
+#include <tqvgroupbox.h>
+#include <tqwhatsthis.h>
+
+// KDE includes.
+
+#include <tdeapplication.h>
+#include <tdeconfig.h>
+#include <kcursor.h>
+#include <kiconloader.h>
+#include <tdelocale.h>
+#include <kstandarddirs.h>
+
+// LibKDcraw includes.
+
+#include <libkdcraw/rnuminput.h>
+
+// Digikam includes.
+
+#include "bcgmodifier.h"
+#include "colorgradientwidget.h"
+#include "dimg.h"
+#include "editortoolsettings.h"
+#include "histogramwidget.h"
+#include "imageiface.h"
+#include "imagewidget.h"
+
+// Local includes.
+
+#include "bcgtool.h"
+#include "bcgtool.moc"
+
+using namespace KDcrawIface;
+using namespace Digikam;
+
+namespace DigikamImagesPluginCore
+{
+
+BCGTool::BCGTool(TQObject* parent)
+       : EditorTool(parent)
+{
+    setName("bcgadjust");
+    setToolName(i18n("Brightness / Contrast / Gamma"));
+    setToolIcon(SmallIcon("contrast"));
+    setToolHelp("bcgadjusttool.anchor");
+
+    m_destinationPreviewData = 0;
+
+    m_previewWidget = new ImageWidget("bcgadjust Tool", 0,
+                                      i18n("<p>Here you can see the image "
+                                           "brightness-contrast-gamma adjustments preview. "
+                                           "You can pick color on image "
+                                           "to see the color level corresponding on histogram."));
+    setToolView(m_previewWidget);
+
+    // -------------------------------------------------------------
+
+    m_gboxSettings = new EditorToolSettings(EditorToolSettings::Default|
+                                            EditorToolSettings::Ok|
+                                            EditorToolSettings::Cancel);
+
+    TQGridLayout* gridSettings = new TQGridLayout(m_gboxSettings->plainPage(), 9, 4);
+
+    TQLabel *label1 = new TQLabel(i18n("Channel:"), m_gboxSettings->plainPage());
+    label1->setAlignment(TQt::AlignRight | TQt::AlignVCenter);
+    m_channelCB = new TQComboBox(false, m_gboxSettings->plainPage());
+    m_channelCB->insertItem(i18n("Luminosity"));
+    m_channelCB->insertItem(i18n("Red"));
+    m_channelCB->insertItem(i18n("Green"));
+    m_channelCB->insertItem(i18n("Blue"));
+    TQWhatsThis::add( m_channelCB, i18n("<p>Select the histogram channel to display here:<p>"
+                                       "<b>Luminosity</b>: display the image's luminosity values.<p>"
+                                       "<b>Red</b>: display the red image-channel values.<p>"
+                                       "<b>Green</b>: display the green image-channel values.<p>"
+                                       "<b>Blue</b>: display the blue image-channel values.<p>"));
+
+    m_scaleBG = new TQHButtonGroup(m_gboxSettings->plainPage());
+    m_scaleBG->setExclusive(true);
+    m_scaleBG->setFrameShape(TQFrame::NoFrame);
+    m_scaleBG->setInsideMargin(0);
+    TQWhatsThis::add( m_scaleBG, i18n("<p>Select the histogram scale here.<p>"
+                                     "If the image's maximal counts are small, you can use the linear scale.<p>"
+                                     "Logarithmic scale can be used when the maximal counts are big; "
+                                     "if it is used, all values (small and large) will be visible on the graph."));
+
+    TQPushButton *linHistoButton = new TQPushButton(m_scaleBG);
+    TQToolTip::add(linHistoButton, i18n("<p>Linear"));
+    m_scaleBG->insert(linHistoButton, HistogramWidget::LinScaleHistogram);
+    TDEGlobal::dirs()->addResourceType("histogram-lin", TDEGlobal::dirs()->kde_default("data") + "digikam/data");
+    TQString directory = TDEGlobal::dirs()->findResourceDir("histogram-lin", "histogram-lin.png");
+    linHistoButton->setPixmap(TQPixmap(directory + "histogram-lin.png"));
+    linHistoButton->setToggleButton(true);
+
+    TQPushButton *logHistoButton = new TQPushButton(m_scaleBG);
+    TQToolTip::add(logHistoButton, i18n("<p>Logarithmic"));
+    m_scaleBG->insert(logHistoButton, HistogramWidget::LogScaleHistogram);
+    TDEGlobal::dirs()->addResourceType("histogram-log", TDEGlobal::dirs()->kde_default("data") + "digikam/data");
+    directory = TDEGlobal::dirs()->findResourceDir("histogram-log", "histogram-log.png");
+    logHistoButton->setPixmap(TQPixmap(directory + "histogram-log.png"));
+    logHistoButton->setToggleButton(true);
+
+    TQHBoxLayout* l1 = new TQHBoxLayout();
+    l1->addWidget(label1);
+    l1->addWidget(m_channelCB);
+    l1->addStretch(10);
+    l1->addWidget(m_scaleBG);
+
+    // -------------------------------------------------------------
+
+    TQVBox *histoBox   = new TQVBox(m_gboxSettings->plainPage());
+    m_histogramWidget = new HistogramWidget(256, 140, histoBox, false, true, true);
+    TQWhatsThis::add( m_histogramWidget, i18n("<p>Here you can see the target preview image histogram drawing "
+                                             "of the selected image channel. This one is re-computed at any "
+                                             "settings changes."));
+    TQLabel *space = new TQLabel(histoBox);
+    space->setFixedHeight(1);
+    m_hGradient = new ColorGradientWidget(ColorGradientWidget::Horizontal, 10, histoBox);
+    m_hGradient->setColors(TQColor("black"), TQColor("white"));
+
+    // -------------------------------------------------------------
+
+    TQLabel *label2 = new TQLabel(i18n("Brightness:"), m_gboxSettings->plainPage());
+    m_bInput       = new RIntNumInput(m_gboxSettings->plainPage());
+    m_bInput->setRange(-100, 100, 1);
+    m_bInput->setDefaultValue(0);
+    TQWhatsThis::add( m_bInput, i18n("<p>Set here the brightness adjustment of the image."));
+
+    TQLabel *label3 = new TQLabel(i18n("Contrast:"), m_gboxSettings->plainPage());
+    m_cInput       = new RIntNumInput(m_gboxSettings->plainPage());
+    m_cInput->setRange(-100, 100, 1);
+    m_cInput->setDefaultValue(0);
+    TQWhatsThis::add( m_cInput, i18n("<p>Set here the contrast adjustment of the image."));
+
+    TQLabel *label4 = new TQLabel(i18n("Gamma:"), m_gboxSettings->plainPage());
+    m_gInput = new RDoubleNumInput(m_gboxSettings->plainPage());
+    m_gInput->setPrecision(2);
+    m_gInput->setRange(0.1, 3.0, 0.01);
+    m_gInput->setDefaultValue(1.0);
+    TQWhatsThis::add( m_gInput, i18n("<p>Set here the gamma adjustment of the image."));
+
+    // -------------------------------------------------------------
+
+    gridSettings->addMultiCellLayout(l1,        0, 0, 0, 4);
+    gridSettings->addMultiCellWidget(histoBox,  1, 2, 0, 4);
+    gridSettings->addMultiCellWidget(label2,    3, 3, 0, 4);
+    gridSettings->addMultiCellWidget(m_bInput,  4, 4, 0, 4);
+    gridSettings->addMultiCellWidget(label3,    5, 5, 0, 4);
+    gridSettings->addMultiCellWidget(m_cInput,  6, 6, 0, 4);
+    gridSettings->addMultiCellWidget(label4,    7, 7, 0, 4);
+    gridSettings->addMultiCellWidget(m_gInput,  8, 8, 0, 4);
+    gridSettings->setRowStretch(9, 10);
+
+    setToolSettings(m_gboxSettings);
+    init();
+
+    // -------------------------------------------------------------
+
+    connect(m_channelCB, TQ_SIGNAL(activated(int)),
+            this, TQ_SLOT(slotChannelChanged(int)));
+
+    connect(m_scaleBG, TQ_SIGNAL(released(int)),
+            this, TQ_SLOT(slotScaleChanged(int)));
+
+    connect(m_previewWidget, TQ_SIGNAL(spotPositionChangedFromTarget( const Digikam::DColor &, const TQPoint & )),
+            this, TQ_SLOT(slotColorSelectedFromTarget( const Digikam::DColor & )));
+
+    connect(m_bInput, TQ_SIGNAL(valueChanged(int)),
+            this, TQ_SLOT(slotTimer()));
+
+    connect(m_cInput, TQ_SIGNAL(valueChanged(int)),
+            this, TQ_SLOT(slotTimer()));
+
+    connect(m_gInput, TQ_SIGNAL(valueChanged(double)),
+            this, TQ_SLOT(slotTimer()));
+
+    connect(m_previewWidget, TQ_SIGNAL(signalResized()),
+            this, TQ_SLOT(slotEffect()));
+
+    // -------------------------------------------------------------
+
+    m_gboxSettings->enableButton(EditorToolSettings::Ok, false);
+}
+
+BCGTool::~BCGTool()
+{
+    if (m_destinationPreviewData)
+       delete [] m_destinationPreviewData;
+}
+
+void BCGTool::slotChannelChanged(int channel)
+{
+    switch (channel)
+    {
+        case LuminosityChannel:
+            m_histogramWidget->m_channelType = HistogramWidget::ValueHistogram;
+            m_hGradient->setColors(TQColor("black"), TQColor("white"));
+            break;
+
+        case RedChannel:
+            m_histogramWidget->m_channelType = HistogramWidget::RedChannelHistogram;
+            m_hGradient->setColors(TQColor("black"), TQColor("red"));
+            break;
+
+        case GreenChannel:
+            m_histogramWidget->m_channelType = HistogramWidget::GreenChannelHistogram;
+            m_hGradient->setColors(TQColor("black"), TQColor("green"));
+            break;
+
+        case BlueChannel:
+            m_histogramWidget->m_channelType = HistogramWidget::BlueChannelHistogram;
+            m_hGradient->setColors(TQColor("black"), TQColor("blue"));
+            break;
+    }
+
+    m_histogramWidget->repaint(false);
+}
+
+void BCGTool::slotScaleChanged(int scale)
+{
+    m_histogramWidget->m_scaleType = scale;
+    m_histogramWidget->repaint(false);
+}
+
+void BCGTool::slotColorSelectedFromTarget(const DColor &color)
+{
+    m_histogramWidget->setHistogramGuideByColor(color);
+}
+
+void BCGTool::readSettings()
+{
+    TDEConfig* config = kapp->config();
+    config->setGroup("bcgadjust Tool");
+    m_channelCB->setCurrentItem(config->readNumEntry("Histogram Channel", 0));    // Luminosity.
+    m_scaleBG->setButton(config->readNumEntry("Histogram Scale", HistogramWidget::LogScaleHistogram));
+    m_bInput->setValue(config->readNumEntry("BrightnessAjustment", m_bInput->defaultValue()));
+    m_cInput->setValue(config->readNumEntry("ContrastAjustment", m_cInput->defaultValue()));
+    m_gInput->setValue(config->readDoubleNumEntry("GammaAjustment", m_gInput->defaultValue()));
+    m_histogramWidget->reset();
+    slotChannelChanged(m_channelCB->currentItem());
+    slotScaleChanged(m_scaleBG->selectedId());
+}
+
+void BCGTool::writeSettings()
+{
+    TDEConfig* config = kapp->config();
+    config->setGroup("bcgadjust Tool");
+    config->writeEntry("Histogram Channel", m_channelCB->currentItem());
+    config->writeEntry("Histogram Scale", m_scaleBG->selectedId());
+    config->writeEntry("BrightnessAjustment", m_bInput->value());
+    config->writeEntry("ContrastAjustment", m_cInput->value());
+    config->writeEntry("GammaAjustment", m_gInput->value());
+    m_previewWidget->writeSettings();
+    config->sync();
+}
+
+void BCGTool::slotResetSettings()
+{
+    m_bInput->blockSignals(true);
+    m_cInput->blockSignals(true);
+    m_gInput->blockSignals(true);
+
+    m_bInput->slotReset();
+    m_cInput->slotReset();
+    m_gInput->slotReset();
+
+    m_bInput->blockSignals(false);
+    m_cInput->blockSignals(false);
+    m_gInput->blockSignals(false);
+
+    slotEffect();
+}
+
+void BCGTool::slotEffect()
+{
+    kapp->setOverrideCursor(KCursor::waitCursor());
+
+    double b = (double) m_bInput->value() / 250.0;
+    double c = (double) (m_cInput->value() / 100.0) + 1.00;
+    double g = m_gInput->value();
+
+    m_gboxSettings->enableButton(EditorToolSettings::Ok,
+                                ( b != 0.0 || c != 1.0 || g != 1.0 ));
+
+    m_histogramWidget->stopHistogramComputation();
+
+    if (m_destinationPreviewData)
+       delete [] m_destinationPreviewData;
+
+    ImageIface* iface = m_previewWidget->imageIface();
+    m_destinationPreviewData   = iface->getPreviewImage();
+    int w                      = iface->previewWidth();
+    int h                      = iface->previewHeight();
+    bool a                     = iface->previewHasAlpha();
+    bool sb                    = iface->previewSixteenBit();
+
+    DImg preview(w, h, sb, a, m_destinationPreviewData);
+    BCGModifier cmod;
+    cmod.setGamma(g);
+    cmod.setBrightness(b);
+    cmod.setContrast(c);
+    cmod.applyBCG(preview);
+    iface->putPreviewImage(preview.bits());
+
+    m_previewWidget->updatePreview();
+
+    // Update histogram.
+
+    memcpy(m_destinationPreviewData, preview.bits(), preview.numBytes());
+    m_histogramWidget->updateData(m_destinationPreviewData, w, h, sb, 0, 0, 0, false);
+
+    kapp->restoreOverrideCursor();
+}
+
+void BCGTool::finalRendering()
+{
+    kapp->setOverrideCursor(KCursor::waitCursor());
+    ImageIface* iface = m_previewWidget->imageIface();
+
+    double b = (double) m_bInput->value() / 250.0;
+    double c = (double) (m_cInput->value() / 100.0) + 1.00;
+    double g = m_gInput->value();
+
+    iface->setOriginalBCG(b, c, g);
+    kapp->restoreOverrideCursor();
+}
+
+}  // NameSpace DigikamImagesPluginCore
+