diff --git a/src/common/QskRgbValue.h b/src/common/QskRgbValue.h
index 6fea8d95..9f7a3d9b 100644
--- a/src/common/QskRgbValue.h
+++ b/src/common/QskRgbValue.h
@@ -461,19 +461,19 @@ namespace QskRgb
         return ( rgb & ColorMask ) | ( ( static_cast< uint >( alpha ) & 0xffu ) << 24 );
     }
 
-    inline QColor toTransparentF( const QColor& color, qreal alpha )
+    inline QColor toTransparentF( const QColor& color, qreal opacity )
     {
-        return toTransparent( color, qRound( alpha * 255 ) );
+        return toTransparent( color, qRound( opacity * 255 ) );
     }
 
-    inline QColor toTransparentF( Qt::GlobalColor color, qreal alpha )
+    inline QColor toTransparentF( Qt::GlobalColor color, qreal opacity )
     {
-        return toTransparent( QColor( color ), qRound( alpha * 255 ) );
+        return toTransparent( QColor( color ), qRound( opacity * 255 ) );
     }
 
-    inline constexpr QRgb toTransparentF( QRgb rgb, qreal alpha ) noexcept
+    inline constexpr QRgb toTransparentF( QRgb rgb, qreal opacity ) noexcept
     {
-        return toTransparent( rgb, qRound( alpha * 255 ) );
+        return toTransparent( rgb, qRound( opacity * 255 ) );
     }
 
     QSK_EXPORT QRgb lighter( QRgb, int factor = 150 ) noexcept;