diff --git a/src/fgt/edit_quality/common/const_types.h b/src/fgt/edit_quality/common/const_types.h
index 8b5623b64..971b81a70 100644
--- a/src/fgt/edit_quality/common/const_types.h
+++ b/src/fgt/edit_quality/common/const_types.h
@@ -50,6 +50,9 @@ typedef unsigned int		UINT32;
 
 #define NUMBER_OF_HISTOGRAM_BINS 200
 
+// The defalut percentile for clamping equalizer histogram
+#define CLAMP_PERCENTILE 90
+
 
 //set of macros used to tell to clearItems method what to remove and\or delete
 //each macro refers to a particular type of graphic item
diff --git a/src/fgt/edit_quality/qualitymapperdialog.cpp b/src/fgt/edit_quality/qualitymapperdialog.cpp
index 68f5f2546..74b449cd2 100644
--- a/src/fgt/edit_quality/qualitymapperdialog.cpp
+++ b/src/fgt/edit_quality/qualitymapperdialog.cpp
@@ -329,36 +329,7 @@ bool QualityMapperDialog::initEqualizerHistogram()
 
 	// SETTING SPNIBOX VALUES
 	// (Se venissero inizializzati prima di impostare setHistogramInfo sulle handles darebbero errore nello SLOT setX delle handles.)
-	double singleStep = (_histogram_info->maxX - _histogram_info->minX) / _histogram_info->chartWidth;
-	int decimals = 0;
-	if (singleStep > std::numeric_limits<float>::epsilon())
-	{	
-		double temp = singleStep;
-		while (temp < 0.1)
-		{
-			decimals++;
-			temp *= 10;
-		}
-		
-	}
-	decimals+=2;
-
-	ui.minSpinBox->setDecimals(decimals);
-	ui.minSpinBox->setValue(_histogram_info->minX);
-	//ui.minSpinBox->setRange(_histogram_info->minX, _histogram_info->maxX);
-	ui.minSpinBox->setRange(2*_histogram_info->minX - _histogram_info->maxX, 2*_histogram_info->maxX - _histogram_info->minX);
-	ui.minSpinBox->setSingleStep(singleStep);
-
-	ui.midSpinBox->setDecimals(decimals);
-	ui.midSpinBox->setValue((_histogram_info->maxX + _histogram_info->minX) / 2.0f);
-	ui.midSpinBox->setRange(_histogram_info->minX, _histogram_info->maxX);
-	ui.midSpinBox->setSingleStep(singleStep);
-
-	ui.maxSpinBox->setDecimals(decimals);
-	ui.maxSpinBox->setValue(_histogram_info->maxX);
-	//ui.maxSpinBox->setRange(_histogram_info->minX, _histogram_info->maxX);
-	ui.maxSpinBox->setRange(2*_histogram_info->minX - _histogram_info->maxX, 2*_histogram_info->maxX - _histogram_info->minX);
-	ui.maxSpinBox->setSingleStep(singleStep);
+	initEqualizerSpinboxes();
 
 	//SETTING UP CONNECTIONS
 	// Connecting spinboxes to handles
@@ -394,6 +365,10 @@ bool QualityMapperDialog::initEqualizerHistogram()
 	connect(_equalizerHandles[MID_HANDLE],   SIGNAL(handleReleased()), this, SLOT(on_Handle_released()));
 	connect(_equalizerHandles[RIGHT_HANDLE], SIGNAL(handleReleased()), this, SLOT(on_Handle_released()));
 	connect(ui.brightnessSlider, SIGNAL(sliderReleased()), this, SLOT(on_Handle_released()));
+	connect(ui.minSpinBox, SIGNAL(editingFinished()), this, SLOT(on_previewButton_clicked()));
+	connect(ui.midSpinBox, SIGNAL(editingFinished()), this, SLOT(on_previewButton_clicked()));
+	connect(ui.maxSpinBox, SIGNAL(editingFinished()), this, SLOT(on_previewButton_clicked()));
+
 
 	ui.equalizerGraphicsView->setScene(&_equalizerHistogramScene);
 
@@ -403,6 +378,41 @@ bool QualityMapperDialog::initEqualizerHistogram()
 	return true;
 }
 
+void QualityMapperDialog::initEqualizerSpinboxes()
+{
+	double singleStep = (_histogram_info->maxX - _histogram_info->minX) / _histogram_info->chartWidth;
+	int decimals = 0;
+	if (singleStep > std::numeric_limits<float>::epsilon())
+	{	
+		double temp = singleStep;
+		while (temp < 0.1)
+		{
+			decimals++;
+			temp *= 10;
+		}
+		
+	}
+	decimals+=2;
+
+	ui.minSpinBox->setDecimals(decimals);
+	ui.minSpinBox->setValue(_histogram_info->minX);
+	//ui.minSpinBox->setRange(_histogram_info->minX, _histogram_info->maxX);
+	ui.minSpinBox->setRange(2*_histogram_info->minX - _histogram_info->maxX, 2*_histogram_info->maxX - _histogram_info->minX);
+	ui.minSpinBox->setSingleStep(singleStep);
+
+	ui.maxSpinBox->setDecimals(decimals);
+	ui.maxSpinBox->setValue(_histogram_info->maxX);
+	//ui.maxSpinBox->setRange(_histogram_info->minX, _histogram_info->maxX);
+	ui.maxSpinBox->setRange(2*_histogram_info->minX - _histogram_info->maxX, 2*_histogram_info->maxX - _histogram_info->minX);
+	ui.maxSpinBox->setSingleStep(singleStep);
+
+	ui.midSpinBox->setDecimals(decimals);
+	ui.midSpinBox->setValue((_histogram_info->maxX + _histogram_info->minX) / 2.0f);
+	ui.midSpinBox->setRange(_histogram_info->minX, _histogram_info->maxX);
+	ui.midSpinBox->setSingleStep(singleStep);
+
+}
+
 // Add histogram bars to equalizerHistogram Scene
 // Return false if mesh has no quality => dialog will not be built
 bool QualityMapperDialog::drawEqualizerHistogram(bool leftHandleIsInsideHistogram, bool rightHandleIsInsideHistogram)
@@ -1261,6 +1271,20 @@ void QualityMapperDialog::on_TF_view_doubleClicked(QPointF pos)
 		on_applyButton_clicked();
 }
 
+// Cut unuseful tails from equalizer histogram
+void QualityMapperDialog::on_clampButton_clicked()
+{
+	_leftHandleWasInsideHistogram = false;
+	_rightHandleWasInsideHistogram = false;
+
+	// Calculate new Min e Max values
+	_histogram_info->minX = _equalizer_histogram->Percentile((float)ui.clampHistogramSpinBox->value()/100.0f);
+	_histogram_info->maxX = _equalizer_histogram->Percentile(1.0f-(float)ui.clampHistogramSpinBox->value()/100.0f);
+
+	initEqualizerSpinboxes(); // reset Spinboxes and handles
+	drawEqualizerHistogram(true, true); // redrawing histogram
+}
+
 //writes in the x-quality label the quality value corresponding to the position of the currently selected TF handle
 void QualityMapperDialog::updateXQualityLabel(float xPos)
 {
@@ -1302,3 +1326,11 @@ void QualityMapperDialog::setEqualizerParameters(EQUALIZER_INFO data)
 		on_applyButton_clicked();
 }
 
+
+
+
+
+void QualityMapperDialog::on_brightnessSlider_valueChanged(int value)
+{
+	ui.brightessSpinBox->setValue((double)value/50.0);
+}
\ No newline at end of file
diff --git a/src/fgt/edit_quality/qualitymapperdialog.h b/src/fgt/edit_quality/qualitymapperdialog.h
index a0d154cba..e44722e24 100644
--- a/src/fgt/edit_quality/qualitymapperdialog.h
+++ b/src/fgt/edit_quality/qualitymapperdialog.h
@@ -150,6 +150,7 @@ private:
 	void updateColorBand(void);
 	void drawTransferFunctionBG(void);
 	bool drawEqualizerHistogram(bool leftHandleInsideHistogram, bool rightHandleInsideHistogram);
+	void initEqualizerSpinboxes();
 	void drawHistogramBars (QGraphicsScene&, CHART_INFO*, int minIndex, int maxIndex, QColor color = QColor(Qt::black));
 
 	GRAPHICS_ITEMS_LIST	*clearScene(QGraphicsScene *scene, int toClean=0);
@@ -169,6 +170,8 @@ signals:
 	void closingDialog();
 
 private slots:
+	void on_brightnessSlider_valueChanged(int);
+	void on_clampButton_clicked();
 	void on_ySpinBox_valueChanged(double);
 	void on_xSpinBox_valueChanged(double);