diff --git a/libs/ui/widgets/kis_curve_widget.cpp b/libs/ui/widgets/kis_curve_widget.cpp
--- a/libs/ui/widgets/kis_curve_widget.cpp
+++ b/libs/ui/widgets/kis_curve_widget.cpp
@@ -77,7 +77,7 @@
     setAutoFillBackground(false);
     setAttribute(Qt::WA_OpaquePaintEvent);
     setMinimumSize(150, 50);
-    setMaximumSize(250, 250);
+    setMaximumSize(16777215, 16777215);
 
     d->setCurveModified();
 
diff --git a/plugins/paintops/colorsmudge/kis_colorsmudgeop_settings_widget.cpp b/plugins/paintops/colorsmudge/kis_colorsmudgeop_settings_widget.cpp
--- a/plugins/paintops/colorsmudge/kis_colorsmudgeop_settings_widget.cpp
+++ b/plugins/paintops/colorsmudge/kis_colorsmudgeop_settings_widget.cpp
@@ -63,9 +63,9 @@
     addPaintOpOption(new KisPressureScatterOptionWidget(), i18n("Scatter"));
     addPaintOpOption(new KisOverlayModeOptionWidget(), i18n("Overlay Mode"));
     addPaintOpOption(new KisCurveOptionWidget(new KisPressureGradientOption(), i18n("0%"), i18n("100%")), i18n("Gradient"));
-    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createHueOption(), KisPressureHSVOption::hueMinLabel(), KisPressureHSVOption::huemaxLabel()), i18n("Hue"));
-    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createSaturationOption(), KisPressureHSVOption::saturationMinLabel(), KisPressureHSVOption::saturationmaxLabel()), i18n("Saturation"));
-    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createValueOption(), KisPressureHSVOption::valueMinLabel(), KisPressureHSVOption::valuemaxLabel()), i18nc("HSV Value", "Value"));
+    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createHueOption(), KisPressureHSVOption::hueMinLabel(), KisPressureHSVOption::huemaxLabel(),false,KisPressureHSVOption::hueMinToolTip(),KisPressureHSVOption::hueMaxToolTip()), i18n("Hue"));
+    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createSaturationOption(), KisPressureHSVOption::saturationMinLabel(), KisPressureHSVOption::saturationmaxLabel(),false,KisPressureHSVOption::saturationMinToolTip(),KisPressureHSVOption::saturationMaxToolTip()), i18n("Saturation"));
+    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createValueOption(), KisPressureHSVOption::valueMinLabel(), KisPressureHSVOption::valuemaxLabel(),false,KisPressureHSVOption::valueMinToolTip(),KisPressureHSVOption::valueMaxToolTip()), i18nc("HSV Value", "Value"));
 
     addPaintOpOption(new KisTextureOption(), i18n("Pattern"));
     addPaintOpOption(new KisCurveOptionWidget(new KisPressureTextureStrengthOption(), i18n("Weak"), i18n("Strong")), i18n("Strength"));
diff --git a/plugins/paintops/defaultpaintops/brush/kis_brushop_settings_widget.cpp b/plugins/paintops/defaultpaintops/brush/kis_brushop_settings_widget.cpp
--- a/plugins/paintops/defaultpaintops/brush/kis_brushop_settings_widget.cpp
+++ b/plugins/paintops/defaultpaintops/brush/kis_brushop_settings_widget.cpp
@@ -74,9 +74,9 @@
     addPaintOpOption(new KisColorSourceOptionWidget(), i18n("Source"));
     addPaintOpOption(new KisCurveOptionWidget(new KisPressureDarkenOption(), i18n("0.0"), i18n("1.0")), i18n("Darken"));
     addPaintOpOption(new KisCurveOptionWidget(new KisPressureMixOption(), i18n("Foreground"), i18n("Background")), i18n("Mix"));
-    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createHueOption(), KisPressureHSVOption::hueMinLabel(), KisPressureHSVOption::huemaxLabel()), i18n("Hue"));
-    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createSaturationOption(), KisPressureHSVOption::saturationMinLabel(), KisPressureHSVOption::saturationmaxLabel()), i18n("Saturation"));
-    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createValueOption(), KisPressureHSVOption::valueMinLabel(), KisPressureHSVOption::valuemaxLabel()), i18nc("HSV Value", "Value"));
+    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createHueOption(), KisPressureHSVOption::hueMinLabel(), KisPressureHSVOption::huemaxLabel(),false,KisPressureHSVOption::hueMinToolTip(),KisPressureHSVOption::hueMaxToolTip()), i18n("Hue"));
+    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createSaturationOption(), KisPressureHSVOption::saturationMinLabel(), KisPressureHSVOption::saturationmaxLabel(),false,KisPressureHSVOption::saturationMinToolTip(), KisPressureHSVOption::saturationMaxToolTip()), i18n("Saturation"));
+    addPaintOpOption(new KisCurveOptionWidget(KisPressureHSVOption::createValueOption(), KisPressureHSVOption::valueMinLabel(), KisPressureHSVOption::valuemaxLabel(),false,KisPressureHSVOption::valueMinToolTip(),KisPressureHSVOption::valueMaxToolTip()), i18nc("HSV Value", "Value"));
     addPaintOpOption(new KisAirbrushOptionWidget(false), i18n("Airbrush"));
     addPaintOpOption(new KisCurveOptionWidget(new KisPressureRateOption(), i18n("0%"), i18n("100%")), i18n("Rate"));
 
diff --git a/plugins/paintops/libpaintop/forms/wdgcurveoption.ui b/plugins/paintops/libpaintop/forms/wdgcurveoption.ui
--- a/plugins/paintops/libpaintop/forms/wdgcurveoption.ui
+++ b/plugins/paintops/libpaintop/forms/wdgcurveoption.ui
@@ -42,6 +42,9 @@
    </item>
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <property name="spacing">
+      <number>6</number>
+     </property>
      <item>
       <widget class="QCheckBox" name="checkBoxUseCurve">
        <property name="minimumSize">
@@ -57,10 +60,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="linearCurveButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -76,10 +85,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="revLinearButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -95,10 +110,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="sCurveButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -114,10 +135,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="reverseSCurveButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -133,10 +160,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="uCurveButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -152,10 +185,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="revUCurveButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -171,10 +210,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="jCurveButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -190,10 +235,16 @@
      </item>
      <item>
       <widget class="QPushButton" name="lCurveButton">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
        <property name="maximumSize">
         <size>
-         <width>24</width>
-         <height>24</height>
+         <width>32</width>
+         <height>32</height>
         </size>
        </property>
        <property name="text">
@@ -251,32 +302,6 @@
      </item>
      <item>
       <layout class="QGridLayout" name="gridLayout_2">
-       <item row="0" column="3">
-        <spacer name="horizontalSpacer_2">
-         <property name="orientation">
-          <enum>Qt::Horizontal</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>2</width>
-           <height>2</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="3" column="1">
-        <spacer name="verticalSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>2</width>
-           <height>2</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
        <item row="1" column="1">
         <widget class="QCheckBox" name="checkBoxUseSameCurve">
          <property name="text">
@@ -289,6 +314,9 @@
        </item>
        <item row="0" column="1">
         <layout class="QGridLayout" name="gridLayout">
+         <property name="spacing">
+          <number>3</number>
+         </property>
          <item row="3" column="2">
           <layout class="QVBoxLayout" name="verticalLayout">
            <item>
@@ -378,15 +406,15 @@
          <item row="3" column="1">
           <widget class="KisCurveWidget" name="curveWidget" native="true">
            <property name="sizePolicy">
-            <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
-             <horstretch>1</horstretch>
+            <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+             <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
            <property name="minimumSize">
             <size>
-             <width>200</width>
-             <height>200</height>
+             <width>0</width>
+             <height>0</height>
             </size>
            </property>
           </widget>
@@ -468,15 +496,15 @@
    <container>1</container>
   </customwidget>
   <customwidget>
-   <class>KisMultiSensorsSelector</class>
+   <class>KisCurveWidget</class>
    <extends>QWidget</extends>
-   <header>kis_multi_sensors_selector.h</header>
+   <header>widgets/kis_curve_widget.h</header>
    <container>1</container>
   </customwidget>
   <customwidget>
-   <class>KisCurveWidget</class>
+   <class>KisMultiSensorsSelector</class>
    <extends>QWidget</extends>
-   <header location="global">widgets/kis_curve_widget.h</header>
+   <header>kis_multi_sensors_selector.h</header>
    <container>1</container>
   </customwidget>
  </customwidgets>
diff --git a/plugins/paintops/libpaintop/kis_curve_option_widget.h b/plugins/paintops/libpaintop/kis_curve_option_widget.h
--- a/plugins/paintops/libpaintop/kis_curve_option_widget.h
+++ b/plugins/paintops/libpaintop/kis_curve_option_widget.h
@@ -34,7 +34,7 @@
 {
     Q_OBJECT
 public:
-    KisCurveOptionWidget(KisCurveOption* curveOption, const QString &minLabel, const QString &maxLabel, bool hideSlider = false);
+    KisCurveOptionWidget(KisCurveOption* curveOption, const QString &minLabel, const QString &maxLabel, bool hideSlider = false, const QString &minLabel_tooltip="", const QString &maxLabel_tooltip="");
     ~KisCurveOptionWidget() override;
 
     void writeOptionSetting(KisPropertiesConfigurationSP setting) const override;
diff --git a/plugins/paintops/libpaintop/kis_curve_option_widget.cpp b/plugins/paintops/libpaintop/kis_curve_option_widget.cpp
--- a/plugins/paintops/libpaintop/kis_curve_option_widget.cpp
+++ b/plugins/paintops/libpaintop/kis_curve_option_widget.cpp
@@ -39,7 +39,7 @@
     }
 }
 
-KisCurveOptionWidget::KisCurveOptionWidget(KisCurveOption* curveOption, const QString &minLabel, const QString &maxLabel, bool hideSlider)
+KisCurveOptionWidget::KisCurveOptionWidget(KisCurveOption* curveOption, const QString &minLabel, const QString &maxLabel, bool hideSlider, const QString &minLabel_tooltip, const QString &maxLabel_tooltip)
     : KisPaintOpOption(curveOption->category(), curveOption->isChecked())
     , m_widget(new QWidget)
     , m_curveOptionWidget(new Ui_WdgCurveOption())
@@ -78,7 +78,15 @@
 
 
     m_curveOptionWidget->label_ymin->setText(minLabel);
+    m_curveOptionWidget->label_ymin->setToolTip(minLabel_tooltip);
     m_curveOptionWidget->label_ymax->setText(maxLabel);
+    m_curveOptionWidget->label_ymax->setToolTip(maxLabel_tooltip);
+
+    //underline to the labels who have tooltip
+    if(minLabel_tooltip !="" || maxLabel_tooltip !=""){
+        m_curveOptionWidget->label_ymin->setStyleSheet("border-bottom-width: 1px; border-bottom-style: solid; border-radius: 0px;border-color: #53728E;");
+        m_curveOptionWidget->label_ymax->setStyleSheet("border-bottom-width: 1px; border-bottom-style: solid; border-radius: 0px;border-color: #53728E;");
+    }
 
     // strength settings is shown as 0-100%
     m_curveOptionWidget->strengthSlider->setRange(curveOption->minValue()*100, curveOption->maxValue()*100, 0);
diff --git a/plugins/paintops/libpaintop/kis_pressure_hsv_option.h b/plugins/paintops/libpaintop/kis_pressure_hsv_option.h
--- a/plugins/paintops/libpaintop/kis_pressure_hsv_option.h
+++ b/plugins/paintops/libpaintop/kis_pressure_hsv_option.h
@@ -36,15 +36,21 @@
 public:
     static KisPressureHSVOption* createHueOption();
     static QString hueMinLabel();
+    static QString hueMinToolTip();
     static QString huemaxLabel();
+    static QString hueMaxToolTip();
 
     static KisPressureHSVOption* createSaturationOption();
     static QString saturationMinLabel();
+    static QString saturationMinToolTip();
     static QString saturationmaxLabel();
+    static QString saturationMaxToolTip();
 
     static KisPressureHSVOption* createValueOption();
     static QString valueMinLabel();
+    static QString valueMinToolTip();
     static QString valuemaxLabel();
+    static QString valueMaxToolTip();
 public:
 
     KisPressureHSVOption(const QString& parameterName);
diff --git a/plugins/paintops/libpaintop/kis_pressure_hsv_option.cpp b/plugins/paintops/libpaintop/kis_pressure_hsv_option.cpp
--- a/plugins/paintops/libpaintop/kis_pressure_hsv_option.cpp
+++ b/plugins/paintops/libpaintop/kis_pressure_hsv_option.cpp
@@ -26,24 +26,34 @@
 
 QString KisPressureHSVOption::hueMinLabel()
 {
-    // xgettext: no-c-format
-    QString activeColorMsg = i18n("(0° is active color)");
-    QString br("<br />");
     QString fullPercent = i18n("+180°");
     QString zeroPercent = i18n("-180°");
 
-    return QString(zeroPercent + br + i18n("CCW hue") + br + activeColorMsg);
+    return QString(zeroPercent);
 }
 
-QString KisPressureHSVOption::huemaxLabel()
+QString KisPressureHSVOption::hueMinToolTip()
 {
     // xgettext: no-c-format
     QString activeColorMsg = i18n("(0° is active color)");
     QString br("<br />");
+    return QString(i18n("CCW hue") + br + activeColorMsg);
+}
+
+QString KisPressureHSVOption::huemaxLabel()
+{
     QString fullPercent = i18n("+180°");
     QString zeroPercent = i18n("-180°");
 
-    return QString(fullPercent + br + i18n("CW hue"));
+    return QString(fullPercent);
+}
+
+QString KisPressureHSVOption::hueMaxToolTip()
+{
+    // xgettext: no-c-format
+    QString activeColorMsg = i18n("(0° is active color)");
+    QString br("<br />");
+    return QString(i18n("CW hue") + br + activeColorMsg);
 }
 
 KisPressureHSVOption* KisPressureHSVOption::createSaturationOption() {
@@ -52,25 +62,36 @@
 
 QString KisPressureHSVOption::saturationMinLabel()
 {
-    // xgettext: no-c-format
-    QString activeColorMsg = i18n("(50% is active color)");
-    QString br("<br />");
     QString fullPercent = i18n("+100%");
     QString zeroPercent = i18n("-100%");
 
-    return QString(zeroPercent + br + i18n("Less saturation ") + br + activeColorMsg);
+    return QString(zeroPercent);
 
 }
 
-QString KisPressureHSVOption::saturationmaxLabel()
+QString KisPressureHSVOption::saturationMinToolTip()
 {
     // xgettext: no-c-format
     QString activeColorMsg = i18n("(50% is active color)");
     QString br("<br />");
+
+    return QString(i18n("Less saturation ") + br + activeColorMsg);
+}
+
+QString KisPressureHSVOption::saturationmaxLabel()
+{
     QString fullPercent = i18n("+100%");
     QString zeroPercent = i18n("-100%");
 
-    return QString(fullPercent + br + i18n("More saturation"));
+    return QString(fullPercent);
+}
+
+QString KisPressureHSVOption::saturationMaxToolTip()
+{
+    // xgettext: no-c-format
+    QString activeColorMsg = i18n("(50% is active color)");
+    QString br("<br />");
+    return QString(i18n("More saturation") + br + activeColorMsg);
 }
 
 KisPressureHSVOption* KisPressureHSVOption::createValueOption() {
@@ -79,29 +100,40 @@
 
 QString KisPressureHSVOption::valueMinLabel()
 {
-    // xgettext: no-c-format
-    QString activeColorMsg = i18n("(50% is active color)");
-    QString br("<br />");
     QString fullPercent = i18n("+100%");
     QString zeroPercent = i18n("-100%");
 
-    return QString(zeroPercent + br + i18n("Lower value ") + br + activeColorMsg);
+    return QString(zeroPercent);// + br + i18n("Lower value ") + br + activeColorMsg);
 
 }
 
-QString KisPressureHSVOption::valuemaxLabel()
+QString KisPressureHSVOption::valueMinToolTip()
 {
     // xgettext: no-c-format
     QString activeColorMsg = i18n("(50% is active color)");
     QString br("<br />");
+
+    return QString(i18n("Lower value ") + br + activeColorMsg);
+}
+
+QString KisPressureHSVOption::valuemaxLabel()
+{
     QString fullPercent = i18n("+100%");
     QString zeroPercent = i18n("-100%");
 
-    return QString(fullPercent + br + i18n("Higher value"));
+    return QString(fullPercent);// + br + i18n("Higher value"));
 
 
 }
 
+QString KisPressureHSVOption::valueMaxToolTip()
+{
+    // xgettext: no-c-format
+    QString activeColorMsg = i18n("(50% is active color)");
+    QString br("<br />");
+    return QString(i18n("Higher value")+ br + activeColorMsg);
+}
+
 struct KisPressureHSVOption::Private
 {
     QString parameterName;