diff --git a/examples/boxes/Box.cpp b/examples/boxes/Box.cpp
index defdc82c..dbad97ac 100644
--- a/examples/boxes/Box.cpp
+++ b/examples/boxes/Box.cpp
@@ -63,17 +63,16 @@ void Box::setBackground( FillType type, const QRgb base, bool inverted )
         return;
     }
 
-    double hue, chroma;
-    QskHctColor::getHueAndChroma( base, hue, chroma );
+    const QskHctColor htcColor( base );
 
     if ( type == Solid )
     {
-        setGradient( QskHctColor::rgb( hue, chroma, 50 ) );
+        setGradient( htcColor.toned( 50 ).rgb() );
     }
     else
     {
-        const auto dark = QskHctColor::rgb( hue, chroma, 40 );
-        const auto light = QskHctColor::rgb( hue, chroma, 70 );
+        const auto dark = htcColor.toned( 40 ).rgb();
+        const auto light = htcColor.toned( 70 ).rgb();
 
         const auto orientation =
             static_cast< QskGradient::Orientation >( type - 2 );
@@ -100,12 +99,11 @@ void Box::setBorder( BorderType type, const QRgb base )
             return;
     }
 
-    double hue, chroma;
-    QskHctColor::getHueAndChroma( base, hue, chroma );
+    const QskHctColor htcColor( base );
 
-    const auto dark = QskHctColor::rgb( hue, chroma, 40 );
-    const auto mid = QskHctColor::rgb( hue, chroma, 65 );
-    const auto light = QskHctColor::rgb( hue, chroma, 90 );
+    const auto dark = htcColor.toned( 40 ).rgb();
+    const auto mid = htcColor.toned( 65 ).rgb();
+    const auto light = htcColor.toned( 90 ).rgb();
 
     switch ( static_cast< int >( type ) )
     {
@@ -206,17 +204,13 @@ void Box::setGradient( const QskGradient& gradient )
 void Box::setGradient(
     const QskGradient::Orientation orientation, const QRgb base )
 {
-    double hue, chroma;
-    QskHctColor::getHueAndChroma( base, hue, chroma );
+    const QskHctColor hctColor( base );
 
     QVector< QRgb > rgb;
     rgb.reserve( 10 );
 
     for ( int i = 0; i < 10; i++ )
-    {
-        const auto tone = 90 - i * 7;
-        rgb += QskHctColor::rgb( hue, chroma, tone );
-    }
+        rgb += hctColor.toned( 90 - i * 7 ).rgb();
 
     setGradient( QskGradient( orientation, QskGradient::colorStops( rgb, true ) ) );
 }
diff --git a/examples/gallery/progressbar/ProgressBarPage.cpp b/examples/gallery/progressbar/ProgressBarPage.cpp
index 5bd7a1d7..e3e0146b 100644
--- a/examples/gallery/progressbar/ProgressBarPage.cpp
+++ b/examples/gallery/progressbar/ProgressBarPage.cpp
@@ -27,14 +27,13 @@ namespace
 
         void setTheme( const QRgb base )
         {
-            double hue, chroma;
-            QskHctColor::getHueAndChroma( base, hue, chroma );
+            const QskHctColor hctColor( base );
 
             QVector< QRgb > rgb;
-            rgb += QskHctColor::rgb( hue, chroma, 75 );
-            rgb += QskHctColor::rgb( hue, chroma, 60 );
-            rgb += QskHctColor::rgb( hue, chroma, 45 );
-            rgb += QskHctColor::rgb( hue, chroma, 30 );
+            rgb += hctColor.toned( 75 ).rgb();
+            rgb += hctColor.toned( 60 ).rgb();
+            rgb += hctColor.toned( 45 ).rgb();
+            rgb += hctColor.toned( 30 ).rgb();
 
             const auto stops = QskGradient::colorStops( rgb, true );
 
diff --git a/src/common/QskHctColor.cpp b/src/common/QskHctColor.cpp
index 61a51f55..78adff96 100644
--- a/src/common/QskHctColor.cpp
+++ b/src/common/QskHctColor.cpp
@@ -349,6 +349,21 @@ static inline int delinearized( double rgbComponent )
     return qBound( 0, qRound( v * 255 ), 255 );
 }
 
+static inline double labF( double t )
+{
+    constexpr double e = 216.0 / 24389.0;
+
+    if ( t > e )
+    {
+        return pow( t, 1.0 / 3.0 );
+    }
+    else
+    {
+        constexpr double kappa = 24389.0 / 27.0;
+        return ( kappa * t + 16 ) / 116;
+    }
+}
+
 static inline double labInvf( double ft )
 {
     const double e = 216.0 / 24389.0;
@@ -732,7 +747,7 @@ static QRgb findResultByJ( double hueRadians, double chroma, double y )
     return 0;
 }
 
-QRgb QskHctColor::rgb( double hue, double chroma, double tone )
+static inline QRgb getRgb( double hue, double chroma, double tone )
 {
     if ( chroma < 0.0001 || tone < 0.0001 || tone > 99.9999 )
         return argbFromLstar( tone );
@@ -778,7 +793,7 @@ static XYZ xyzFromArgb( QRgb rgb)
     return matrixMultiply( xyz, SRGB_TO_XYZ );
 }
 
-void QskHctColor::getHueAndChroma( QRgb rgb, double& hue, double& chroma )
+static void getHTC( QRgb rgb, double& hue, double& chroma, double& tone )
 {
     ViewingConditions vc;
 
@@ -832,4 +847,54 @@ void QskHctColor::getHueAndChroma( QRgb rgb, double& hue, double& chroma )
 
         chroma = alpha * sqrt(J / 100.0);
     }
+
+    {
+        tone = 116.0 * labF( y / 100.0 ) - 16.0;
+    }
 }
+
+QskHctColor::QskHctColor( QRgb rgb )
+{
+    getHTC( rgb, m_hue, m_chroma, m_tone );
+}
+
+void QskHctColor::setHue( qreal hue )
+{
+    m_hue = fmod( hue, 360.0 );
+    if ( m_hue < 0.0 )
+        m_hue += 360.0;
+}
+
+void QskHctColor::setChroma( qreal chroma ) noexcept
+{
+    m_chroma = ( chroma < 0.0 ) ? 0.0 : chroma;
+}
+
+void QskHctColor::setTone( qreal tone ) noexcept
+{
+    m_tone = qBound( 0.0, tone, 100.0 );
+}
+
+void QskHctColor::setRgb( QRgb rgb )
+{
+    getHTC( rgb, m_hue, m_chroma, m_tone );
+}
+
+QRgb QskHctColor::rgb() const
+{
+    return getRgb( m_hue, m_chroma, m_tone );
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+
+#include <qdebug.h>
+
+QDebug operator<<( QDebug debug, const QskHctColor& color )
+{
+    debug.nospace() << "HTC("
+        << color.hue() << "," << color.chroma() << "," << color.tone() << ")";
+
+    return debug.space();
+}
+
+#endif
diff --git a/src/common/QskHctColor.h b/src/common/QskHctColor.h
index d8782e12..041c0e4e 100644
--- a/src/common/QskHctColor.h
+++ b/src/common/QskHctColor.h
@@ -20,26 +20,68 @@
 
     https://material-foundation.github.io/material-theme-builder/#/custom
     shows how to create a tonal palette from a given RGB color.
+ */
 
-    The methods in QskHctColor allow to do the same:
-
-        QVector palette( const QRgb rgb )
-        {
-            double hue, chroma;
-            QskHctColor::getHueAndChroma( rgb, hue, chroma );
-
-            QVector< QRgb > pal;
-            for ( int tone = 0; tone <= 100; tone += 10 )
-                pal += QskHctColor::rgb( hue, chroma, tone );
-
-            return pal;
-        }
-*/
-
-namespace QskHctColor
+class QSK_EXPORT QskHctColor
+{
+  public:
+    constexpr QskHctColor() noexcept = default;
+    constexpr QskHctColor( qreal hue, qreal chrome, qreal tone = 40 ) noexcept;
+
+    QskHctColor( QRgb );
+
+    void setHue( qreal hue );
+    constexpr qreal hue() const noexcept;
+
+    void setChroma( qreal chroma ) noexcept;
+    constexpr qreal chroma() const noexcept;
+
+    void setTone( qreal tone ) noexcept;
+    constexpr qreal tone() const noexcept;
+
+    constexpr QskHctColor toned( qreal tone ) const noexcept;
+
+    void setRgb( QRgb );
+    QRgb rgb() const;
+
+  private:
+    qreal m_hue = 0;    // [0.0, 360.0[
+    qreal m_chroma = 0;
+    qreal m_tone = 0;   // [0.0, 100.0]
+};
+
+Q_DECLARE_TYPEINFO( QskHctColor, Q_MOVABLE_TYPE );
+
+inline constexpr QskHctColor::QskHctColor( qreal hue, qreal chroma, qreal tone ) noexcept
+    : m_hue( hue )
+    , m_chroma( chroma )
+    , m_tone( tone )
 {
-    QSK_EXPORT QRgb rgb( double hue, double chroma, double tone );
-    QSK_EXPORT void getHueAndChroma( QRgb rgb, double& hue, double& chroma );
 }
 
+inline constexpr qreal QskHctColor::hue() const noexcept
+{
+    return m_hue;
+}
+
+inline constexpr qreal QskHctColor::chroma() const noexcept
+{
+    return m_chroma;
+}
+
+inline constexpr qreal QskHctColor::tone() const noexcept
+{
+    return m_tone;
+}
+
+inline constexpr QskHctColor QskHctColor::toned( qreal tone ) const noexcept
+{
+    return QskHctColor( m_hue, m_chroma, tone );
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+    class QDebug;
+    QSK_EXPORT QDebug operator<<( QDebug, const QskHctColor& );
+#endif
+
 #endif