Index: gtk2/common/common.h
===================================================================
--- gtk2/common/common.h
+++ gtk2/common/common.h
@@ -630,7 +630,8 @@
                      windowBorder,
                      bgndOpacity,
                      menuBgndOpacity,
-                     dlgOpacity;
+                     dlgOpacity,
+                     shadowSize;
     EStripe          stripedProgress;
     ESliderStyle     sliderStyle;
     EMouseOver       coloredMouseOver;
Index: gtk2/common/config_file.cpp
===================================================================
--- gtk2/common/config_file.cpp
+++ gtk2/common/config_file.cpp
@@ -1377,6 +1377,8 @@
             CFG_READ_INT(bgndOpacity);
             CFG_READ_INT(menuBgndOpacity);
             CFG_READ_INT(dlgOpacity);
+            CFG_READ_INT(shadowSize);
+            qtcX11SetShadowSize(opts->shadowSize);
             CFG_READ_SHADE(menuStripe, true, true, &opts->customMenuStripeColor);
             CFG_READ_APPEARANCE(menuStripeAppearance, APP_ALLOW_BASIC);
             CFG_READ_SHADE(comboBtn, true, false, &opts->customComboBtnColor);
@@ -1749,6 +1751,7 @@
     opts->stdSidebarButtons=false;
     opts->toolbarTabs=false;
     opts->bgndOpacity = opts->dlgOpacity = opts->menuBgndOpacity = 100;
+    opts->shadowSize = qtcX11ShadowSize();
     opts->gtkComboMenus=false;
     opts->noBgndGradientApps=nullptr;
     opts->noBgndOpacityApps=g_strsplit("sonata,totem,vmware,vmplayer",",", -1);;
Index: lib/utils/options.h
===================================================================
--- lib/utils/options.h
+++ lib/utils/options.h
@@ -180,6 +180,15 @@
     return qtcMax(qtcScrollbarButtonNum(type), 2);
 }
 
+/**
+ * shadow size control for X11.
+ **/
+
+void
+qtcX11SetShadowSize(int);
+int
+qtcX11ShadowSize();
+
 namespace QtCurve {
 namespace Config {
 
Index: lib/utils/x11helpers.cpp
===================================================================
--- lib/utils/x11helpers.cpp
+++ lib/utils/x11helpers.cpp
@@ -27,6 +27,8 @@
 #include "x11qtc.h"
 #include "x11wrap.h"
 
+static int shadow_size = 30;
+
 #ifdef QTC_ENABLE_X11
 
 #include "log.h"
@@ -75,7 +77,6 @@
 void
 qtcX11ShadowInit()
 {
-    int shadow_size = 30;
     int shadow_radius = 4;
     QtcColor c1 = {0.4, 0.4, 0.4};
     QtcColor c2 = {0.2, 0.2, 0.2};
@@ -328,3 +329,22 @@
 }
 
 #endif
+
+QTC_EXPORT void
+qtcX11SetShadowSize(int size)
+{
+    if (size >= 0 && size != shadow_size) {
+        shadow_size = size;
+#ifdef QTC_ENABLE_X11
+        qtcX11ShadowDestroy();
+        qtcX11ShadowInit();
+#endif
+    }
+}
+
+QTC_EXPORT int
+qtcX11ShadowSize()
+{
+    return shadow_size;
+}
+
Index: qt4/common/common.h
===================================================================
--- qt4/common/common.h
+++ qt4/common/common.h
@@ -805,7 +805,8 @@
                      windowBorder,
                      bgndOpacity,
                      menuBgndOpacity,
-                     dlgOpacity;
+                     dlgOpacity,
+                     shadowSize;
     int              dwtSettings;
     int              titlebarButtons;
     TBCols           titlebarButtonColors;
Index: qt4/common/config_file.cpp
===================================================================
--- qt4/common/config_file.cpp
+++ qt4/common/config_file.cpp
@@ -1303,6 +1303,8 @@
             CFG_READ_INT(bgndOpacity);
             CFG_READ_INT(menuBgndOpacity);
             CFG_READ_INT(dlgOpacity);
+            CFG_READ_INT(shadowSize);
+            qtcX11SetShadowSize(opts->shadowSize);
             CFG_READ_SHADE(menuStripe, true, true, &opts->customMenuStripeColor);
             CFG_READ_APPEARANCE(menuStripeAppearance, APP_ALLOW_BASIC);
             CFG_READ_SHADE(comboBtn, true, false, &opts->customComboBtnColor);
@@ -1599,6 +1601,7 @@
     opts->stdSidebarButtons=false;
     opts->toolbarTabs=false;
     opts->bgndOpacity=opts->dlgOpacity=opts->menuBgndOpacity=100;
+    opts->shadowSize = qtcX11ShadowSize();
     opts->gtkComboMenus=false;
     opts->customMenubarsColor.setRgb(0, 0, 0);
     opts->customSlidersColor.setRgb(0, 0, 0);
@@ -2319,6 +2322,7 @@
         CFG_WRITE_ENTRY_NUM(bgndOpacity);
         CFG_WRITE_ENTRY_NUM(menuBgndOpacity);
         CFG_WRITE_ENTRY_NUM(dlgOpacity);
+        CFG_WRITE_ENTRY_NUM(shadowSize);
         CFG_WRITE_ENTRY(stdBtnSizes);
         CFG_WRITE_ENTRY_NUM(titlebarButtons);
         CFG_WRITE_ENTRY(titlebarIcon);
Index: qt4/config/qtcurveconfig.cpp
===================================================================
--- qt4/config/qtcurveconfig.cpp
+++ qt4/config/qtcurveconfig.cpp
@@ -960,6 +960,12 @@
     dlgOpacity->setValue(100);
     menuBgndOpacity->setRange(0, 100, 5);
     menuBgndOpacity->setValue(100);
+    dropShadowSize->setRange(0, 100);
+    dropShadowSize->setSingleStep(1);
+    dropShadowSize->setValue(qtcX11ShadowSize());
+#ifndef QTC_ENABLE_X11
+    dropShadowSize->setEnabled(false);
+#endif
 
     sliderWidth->setRange(MIN_SLIDER_WIDTH, MAX_SLIDER_WIDTH, 2);
     sliderWidth->setValue(DEFAULT_SLIDER_WIDTH);
@@ -1109,6 +1115,7 @@
     connect(dlgOpacity, SIGNAL(valueChanged(int)), SLOT(updateChanged()));
     connect(menuBgndImage, SIGNAL(currentIndexChanged(int)), SLOT(menuBgndImageChanged()));
     connect(menuBgndOpacity, SIGNAL(valueChanged(int)), SLOT(updateChanged()));
+    connect(dropShadowSize, SIGNAL(valueChanged(int)), SLOT(updateChanged()));
     connect(dwtAppearance, SIGNAL(currentIndexChanged(int)), SLOT(updateChanged()));
     connect(tooltipAppearance, SIGNAL(currentIndexChanged(int)), SLOT(updateChanged()));
     connect(dwtBtnAsPerTitleBar, SIGNAL(toggled(bool)), SLOT(updateChanged()));
@@ -3082,6 +3089,8 @@
     opts.dlgOpacity=dlgOpacity->value();
     opts.menuBgndImage.type=(EImageType)menuBgndImage->currentIndex();
     opts.menuBgndOpacity=menuBgndOpacity->value();
+    opts.shadowSize=dropShadowSize->value();
+    qtcX11SetShadowSize(opts.shadowSize);
     opts.dwtAppearance=(EAppearance)dwtAppearance->currentIndex();
     opts.tooltipAppearance=(EAppearance)tooltipAppearance->currentIndex();
     opts.xbar=xbar->isChecked();
@@ -3392,6 +3401,7 @@
     dlgOpacity->setValue(opts.dlgOpacity);
     menuBgndImage->setCurrentIndex(opts.menuBgndImage.type);
     menuBgndOpacity->setValue(opts.menuBgndOpacity);
+    dropShadowSize->setValue(qtcX11ShadowSize());
     dwtAppearance->setCurrentIndex(opts.dwtAppearance);
     tooltipAppearance->setCurrentIndex(opts.tooltipAppearance);
     dwtBtnAsPerTitleBar->setChecked(opts.dwtSettings&DWT_BUTTONS_AS_PER_TITLEBAR);
@@ -3771,6 +3781,7 @@
          dlgOpacity->value()!=opts.dlgOpacity ||
          menuBgndImage->currentIndex()!=opts.menuBgndImage.type ||
          menuBgndOpacity->value()!=opts.menuBgndOpacity ||
+         dropShadowSize->value()!=opts.shadowSize ||
          dwtAppearance->currentIndex()!=opts.dwtAppearance ||
          tooltipAppearance->currentIndex()!=opts.tooltipAppearance ||
          xbar->isChecked()!=opts.xbar ||
Index: qt4/config/qtcurveconfigbase.ui
===================================================================
--- qt4/config/qtcurveconfigbase.ui
+++ qt4/config/qtcurveconfigbase.ui
@@ -3759,6 +3759,20 @@
          </property>
         </widget>
        </item>
+       <item row="6" column="0">
+        <widget class="QLabel" name="shadowSizeLabel">
+         <property name="text">
+          <string>Drop shadow size:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="6" column="1">
+        <widget class="QSpinBox" name="dropShadowSize">
+         <property name="toolTip">
+          <string>&lt;p&gt;Sets the base value used for determining drop shadow sizes.&lt;/p&gt;&lt;p&gt;X11 only.</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="page_26">
Index: qt5/common/common.h
===================================================================
--- qt5/common/common.h
+++ qt5/common/common.h
@@ -798,7 +798,8 @@
                      windowBorder,
                      bgndOpacity,
                      menuBgndOpacity,
-                     dlgOpacity;
+                     dlgOpacity,
+                     shadowSize;
     int              dwtSettings;
     int              titlebarButtons;
     TBCols           titlebarButtonColors;
Index: qt5/common/config_file.cpp
===================================================================
--- qt5/common/config_file.cpp
+++ qt5/common/config_file.cpp
@@ -1308,6 +1308,8 @@
             CFG_READ_INT(bgndOpacity);
             CFG_READ_INT(menuBgndOpacity);
             CFG_READ_INT(dlgOpacity);
+            CFG_READ_INT(shadowSize);
+            qtcX11SetShadowSize(opts->shadowSize);
             CFG_READ_SHADE(menuStripe, true, true, &opts->customMenuStripeColor);
             CFG_READ_APPEARANCE(menuStripeAppearance, APP_ALLOW_BASIC);
             CFG_READ_SHADE(comboBtn, true, false, &opts->customComboBtnColor);
@@ -1607,6 +1609,7 @@
     opts->stdSidebarButtons=false;
     opts->toolbarTabs=false;
     opts->bgndOpacity=opts->dlgOpacity=opts->menuBgndOpacity=100;
+    opts->shadowSize = qtcX11ShadowSize();
     opts->gtkComboMenus=false;
     opts->customMenubarsColor.setRgb(0, 0, 0);
     opts->customSlidersColor.setRgb(0, 0, 0);
@@ -2330,6 +2333,7 @@
         CFG_WRITE_ENTRY_NUM(bgndOpacity);
         CFG_WRITE_ENTRY_NUM(menuBgndOpacity);
         CFG_WRITE_ENTRY_NUM(dlgOpacity);
+        CFG_WRITE_ENTRY_NUM(shadowSize);
         CFG_WRITE_ENTRY(stdBtnSizes);
         CFG_WRITE_ENTRY_NUM(titlebarButtons);
         CFG_WRITE_ENTRY(titlebarIcon);
Index: qt5/config/qtcurveconfig.cpp
===================================================================
--- qt5/config/qtcurveconfig.cpp
+++ qt5/config/qtcurveconfig.cpp
@@ -972,6 +972,13 @@
     menuBgndOpacity->setRange(0, 100);
     menuBgndOpacity->setSingleStep(5);
     menuBgndOpacity->setValue(100);
+    dropShadowSize->setRange(0, 100);
+    dropShadowSize->setSingleStep(1);
+    dropShadowSize->setValue(qtcX11ShadowSize());
+#ifndef QTC_ENABLE_X11
+    dropShadowSize->setEnabled(false);
+#endif
+
 
     sliderWidth->setRange(MIN_SLIDER_WIDTH, MAX_SLIDER_WIDTH);
     sliderWidth->setSingleStep(2);
@@ -1000,7 +1007,7 @@
 
     for (auto *w: {lighterPopupMenuBgnd, tabBgnd, menuDelay, menuCloseDelay, crHighlight,
                 expanderHighlight, colorSelTab, highlightFactor, bgndOpacity,
-                dlgOpacity, menuBgndOpacity, splitterHighlight, gbFactor}) {
+                dlgOpacity, menuBgndOpacity, splitterHighlight, gbFactor, dropShadowSize}) {
         connect(qtcSlot(w, valueChanged, (int)), qtcSlot(this, updateChanged));
     }
 
@@ -3045,6 +3052,8 @@
     opts.dlgOpacity=dlgOpacity->value();
     opts.menuBgndImage.type=(EImageType)menuBgndImage->currentIndex();
     opts.menuBgndOpacity=menuBgndOpacity->value();
+    opts.shadowSize=dropShadowSize->value();
+    qtcX11SetShadowSize(opts.shadowSize);
     opts.dwtAppearance=(EAppearance)dwtAppearance->currentIndex();
     opts.tooltipAppearance=(EAppearance)tooltipAppearance->currentIndex();
     opts.crColor=(EShade)crColor->currentIndex();
@@ -3357,6 +3366,7 @@
     dlgOpacity->setValue(opts.dlgOpacity);
     menuBgndImage->setCurrentIndex(opts.menuBgndImage.type);
     menuBgndOpacity->setValue(opts.menuBgndOpacity);
+    dropShadowSize->setValue(qtcX11ShadowSize());
     dwtAppearance->setCurrentIndex(opts.dwtAppearance);
     tooltipAppearance->setCurrentIndex(opts.tooltipAppearance);
     dwtBtnAsPerTitleBar->setChecked(opts.dwtSettings&DWT_BUTTONS_AS_PER_TITLEBAR);
@@ -3738,6 +3748,7 @@
          dlgOpacity->value()!=opts.dlgOpacity ||
          menuBgndImage->currentIndex()!=opts.menuBgndImage.type ||
          menuBgndOpacity->value()!=opts.menuBgndOpacity ||
+         dropShadowSize->value()!=opts.shadowSize ||
          dwtAppearance->currentIndex()!=opts.dwtAppearance ||
          tooltipAppearance->currentIndex()!=opts.tooltipAppearance ||
          crColor->currentIndex()!=opts.crColor ||
Index: qt5/config/qtcurveconfigbase.ui
===================================================================
--- qt5/config/qtcurveconfigbase.ui
+++ qt5/config/qtcurveconfigbase.ui
@@ -3823,6 +3823,20 @@
          </property>
         </widget>
        </item>
+       <item row="6" column="0">
+        <widget class="QLabel" name="shadowSizeLabel">
+         <property name="text">
+          <string>Drop shadow size:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="6" column="1">
+        <widget class="QSpinBox" name="dropShadowSize">
+         <property name="toolTip">
+          <string>&lt;p&gt;Sets the base value used for determining drop shadow sizes.&lt;/p&gt;&lt;p&gt;X11 only.</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="page_26">