diff --git a/src/common/QskRgbValue.cpp b/src/common/QskRgbValue.cpp
index 4aeaa63d..5dcb8b45 100644
--- a/src/common/QskRgbValue.cpp
+++ b/src/common/QskRgbValue.cpp
@@ -122,3 +122,34 @@ QColor QskRgbValue::interpolated( const QColor& c1, const QColor& c2, qreal rati
     else
         return qskInterpolatedColor( c1.convertTo( c2.spec() ), c2, ratio );
 }
+
+QRgb QskRgbValue::rgb( Qt::GlobalColor color )
+{
+    using namespace QskRgbValue;
+
+    static constexpr QRgb rgbValues[] =
+    {
+        White,   // Qt::color0
+        Black,   // Qt::color1
+        Black,   // Qt::black
+        White,   // Qt::white
+        Grey,    // Qt::darkGray
+        qRgb( 160, 160, 164 ), // Qt::gray
+        Silver,  // Qt::lightGray
+        Red,     // Qt::red
+        Lime,    // Qt::green
+        Blue,    // Qt::blue
+        Cyan,    // Qt::cyan
+        Magenta, // Qt::magenta
+        Yellow,  // Qt::yellow
+        Maroon,  // Qt::darkRed
+        Green,   // Qt::darkGreen
+        Navy,    // Qt::darkBlue
+        Teal,    // Qt::darkCyan
+        Purple,  // Qt::darkMagenta
+        Olive, // Qt::darkYellow
+        Transparent // Qt::transparent
+    };
+
+    return rgbValues[ color ];
+}
diff --git a/src/common/QskRgbValue.h b/src/common/QskRgbValue.h
index e6ebbe89..fd990d47 100644
--- a/src/common/QskRgbValue.h
+++ b/src/common/QskRgbValue.h
@@ -56,7 +56,7 @@
     RGB( Aquamarine, 0xff7fffd4 ) \
     RGB( Maroon, 0xff800000 ) \
     RGB( Purple, 0xff800080 ) \
-    RGB( Olive, 0xff808080 ) \
+    RGB( Olive, 0xff808000 ) \
     RGB( Grey, 0xff808080 ) \
     RGB( SkyBlue, 0xff87ceeb ) \
     RGB( LightSkyBlue, 0xff87cefa ) \
@@ -425,6 +425,7 @@
     RGB( BlueGrey800, 0xff37474f ) \
     RGB( BlueGrey900, 0xff263238 ) \
     \
+    RGB( Transparent, 0x00000000 ) \
     RGB( AlphaMask, 0xff000000 ) \
     RGB( ColorMask, 0x00ffffff )
 
@@ -434,6 +435,7 @@ namespace QskRgbValue
     QSK_RGB_VALUES
 #undef RGB
 
+    QSK_EXPORT QRgb rgb( Qt::GlobalColor );
     QSK_EXPORT QRgb interpolated( QRgb rgb1, QRgb rgb2, qreal ratio );
     QSK_EXPORT QColor interpolated( const QColor& c1, const QColor& c2, qreal ratio );