diff --git a/src/meshlabplugins/edit_quality/common/transferfunction.cpp b/src/meshlabplugins/edit_quality/common/transferfunction.cpp
index cacae5fc5..55f94bf81 100644
--- a/src/meshlabplugins/edit_quality/common/transferfunction.cpp
+++ b/src/meshlabplugins/edit_quality/common/transferfunction.cpp
@@ -214,6 +214,15 @@ bool TfChannel::isTail(TF_KEY *key)
     return ( key->x == 1.0f );
 }
 
+void TfChannel::flip()
+{
+	for (KEY_LISTiterator it = KEYS.begin(); it != KEYS.end(); it++)
+		(*it)->x = 1.0 - (*it)->x;
+
+	this->updateKeysOrder();
+}
+
+
 //this method is called by TFHandle and is used to update the TfHandle position from graphics to logical level.
 //When the key value is updated, the keys list must be checked to restore the sorting and the right alternation of LEFT\RIGHT JUNCTION SIDE keys
 void TfChannel::updateKeysOrder()
@@ -541,6 +550,15 @@ Color4b TransferFunction::getColorByQuality (float absoluteQuality, float minQua
     return currentColor;
 }
 
+void TransferFunction::flipRamp()
+{
+	//for each channel...
+	for (size_t i = 0; i<NUMBER_OF_CHANNELS; i++)
+	{
+		_channels[i].flip();
+	}
+}
+
 //saves the current color band onto an external file
 //moreover it saves info about the equalizer state
 //returns the name of the file
diff --git a/src/meshlabplugins/edit_quality/common/transferfunction.h b/src/meshlabplugins/edit_quality/common/transferfunction.h
index bc1aca56a..8284240c5 100644
--- a/src/meshlabplugins/edit_quality/common/transferfunction.h
+++ b/src/meshlabplugins/edit_quality/common/transferfunction.h
@@ -131,6 +131,7 @@ public:
 	TF_KEY		*addKey(TF_KEY *newKey);
 	void		removeKey(int index);
 	void		removeKey(TF_KEY *key);
+	void		flip();
 
 	float	getChannelValuef(float x_position);
 	UINT8	getChannelValueb(float x_position);
@@ -212,6 +213,7 @@ public:
 	TfChannel&	operator [](int i)				{ return _channels[_channels_order[i]];	}
 	size_t size();
 	QColor* buildColorBand(void);
+	void flipRamp();
 	QString saveColorBand(QString fileName, EQUALIZER_INFO& equalizerInfo);
 	vcg::Color4b getColorByQuality(float percentageQuality);
 	vcg::Color4b getColorByQuality(float absoluteQuality, float minQuality, float maxQuality, float midRelativeQuality, float brightness);
diff --git a/src/meshlabplugins/edit_quality/qualitymapperdialog.cpp b/src/meshlabplugins/edit_quality/qualitymapperdialog.cpp
index b68e651c0..273f0d081 100644
--- a/src/meshlabplugins/edit_quality/qualitymapperdialog.cpp
+++ b/src/meshlabplugins/edit_quality/qualitymapperdialog.cpp
@@ -775,6 +775,23 @@ void QualityMapperDialog::drawTransferFunctionBG ()
 	}
 }
 
+//callback for flip button click
+void QualityMapperDialog::on_flipButton_clicked()
+{
+	// flip values in ramp
+	_transferFunction->flipRamp();
+
+	//preparing TF to work
+	this->initTF();
+
+	//drawing new TF
+	this->drawTransferFunction();
+
+	//applying preview if necessary
+	if (ui.previewButton->isChecked())
+		on_applyButton_clicked();
+}
+
 //callback for save button click
 void QualityMapperDialog::on_savePresetButton_clicked()
 {
diff --git a/src/meshlabplugins/edit_quality/qualitymapperdialog.h b/src/meshlabplugins/edit_quality/qualitymapperdialog.h
index 50c51f68e..ccd9f1bca 100644
--- a/src/meshlabplugins/edit_quality/qualitymapperdialog.h
+++ b/src/meshlabplugins/edit_quality/qualitymapperdialog.h
@@ -215,6 +215,7 @@ private slots:
 	void on_redButton_toggled(bool checked);
 
 	void on_presetComboBox_currentTextChanged(const QString &);
+	void on_flipButton_clicked();
 	void on_loadPresetButton_clicked();
 	void on_savePresetButton_clicked();
 
diff --git a/src/meshlabplugins/edit_quality/qualitymapperdialog.ui b/src/meshlabplugins/edit_quality/qualitymapperdialog.ui
index ccf07be6d..5873d5a60 100644
--- a/src/meshlabplugins/edit_quality/qualitymapperdialog.ui
+++ b/src/meshlabplugins/edit_quality/qualitymapperdialog.ui
@@ -234,34 +234,6 @@
                  </item>
                 </layout>
                </item>
-               <item>
-                <layout class="QHBoxLayout">
-                 <item>
-                  <widget class="QLabel" name="xQualityLabel">
-                   <property name="font">
-                    <font>
-                     <pointsize>10</pointsize>
-                    </font>
-                   </property>
-                   <property name="text">
-                    <string>x-quality</string>
-                   </property>
-                  </widget>
-                 </item>
-                 <item>
-                  <widget class="QLabel" name="invisibleQualityLabel">
-                   <property name="font">
-                    <font>
-                     <pointsize>10</pointsize>
-                    </font>
-                   </property>
-                   <property name="text">
-                    <string>quality</string>
-                   </property>
-                  </widget>
-                 </item>
-                </layout>
-               </item>
               </layout>
              </widget>
             </item>
@@ -274,51 +246,81 @@
                </sizepolicy>
               </property>
               <property name="title">
-               <string>Load Preset</string>
+               <string>Preset Ramps</string>
               </property>
-              <layout class="QHBoxLayout">
+              <layout class="QVBoxLayout" name="verticalLayout_2">
                <item>
-                <widget class="QComboBox" name="presetComboBox">
-                 <property name="toolTip">
-                  <string>Transfer Functions list</string>
+                <layout class="QHBoxLayout" name="horizontalLayout_4">
+                 <property name="topMargin">
+                  <number>0</number>
                  </property>
-                 <property name="editable">
-                  <bool>true</bool>
-                 </property>
-                </widget>
+                 <item>
+                  <widget class="QComboBox" name="presetComboBox">
+                   <property name="toolTip">
+                    <string>Transfer Functions list</string>
+                   </property>
+                   <property name="editable">
+                    <bool>true</bool>
+                   </property>
+                  </widget>
+                 </item>
+                </layout>
                </item>
                <item>
-                <widget class="QPushButton" name="loadPresetButton">
-                 <property name="maximumSize">
-                  <size>
-                   <width>30</width>
-                   <height>16777215</height>
-                  </size>
+                <layout class="QHBoxLayout" name="horizontalLayout_5">
+                 <property name="topMargin">
+                  <number>5</number>
                  </property>
-                 <property name="toolTip">
-                  <string>click to load a Transfer Function file</string>
-                 </property>
-                 <property name="icon">
-                  <iconset resource="qualitymapper.qrc">
-                   <normaloff>:/images/opentf.png</normaloff>:/images/opentf.png</iconset>
-                 </property>
-                </widget>
-               </item>
-               <item>
-                <widget class="QPushButton" name="savePresetButton">
-                 <property name="maximumSize">
-                  <size>
-                   <width>30</width>
-                   <height>16777215</height>
-                  </size>
-                 </property>
-                 <property name="toolTip">
-                  <string>Add/Save preset</string>
-                 </property>
-                 <property name="text">
-                  <string>+</string>
-                 </property>
-                </widget>
+                 <item>
+                  <widget class="QPushButton" name="flipButton">
+                   <property name="maximumSize">
+                    <size>
+                     <width>30</width>
+                     <height>16777215</height>
+                    </size>
+                   </property>
+                   <property name="toolTip">
+                    <string>Flip Current Ramp Direction</string>
+                   </property>
+                   <property name="text">
+                    <string>Flip</string>
+                   </property>
+                  </widget>
+                 </item>
+                 <item>
+                  <widget class="QPushButton" name="loadPresetButton">
+                   <property name="maximumSize">
+                    <size>
+                     <width>30</width>
+                     <height>16777215</height>
+                    </size>
+                   </property>
+                   <property name="toolTip">
+                    <string>click to load a Transfer Function file</string>
+                   </property>
+                   <property name="icon">
+                    <iconset resource="qualitymapper.qrc">
+                     <normaloff>:/images/opentf.png</normaloff>:/images/opentf.png</iconset>
+                   </property>
+                  </widget>
+                 </item>
+                 <item>
+                  <widget class="QPushButton" name="savePresetButton">
+                   <property name="maximumSize">
+                    <size>
+                     <width>30</width>
+                     <height>16777215</height>
+                    </size>
+                   </property>
+                   <property name="toolTip">
+                    <string>Add/Save preset</string>
+                   </property>
+                   <property name="text">
+                    <string>+</string>
+                   </property>
+                  </widget>
+                 </item>
+                </layout>
                </item>
               </layout>
              </widget>