diff --git a/qml/main.qml b/qml/main.qml
index e6f59e0..4029171 100644
--- a/qml/main.qml
+++ b/qml/main.qml
@@ -67,7 +67,7 @@ Item {
 
         onNewColor: {
             background.color = color
-            rootItem.darkMode = lightness < 128 ? true : false
+            rootItem.darkMode = darkMode
         }
     }
 
diff --git a/src/backgroundhelper.cpp b/src/backgroundhelper.cpp
index 2a2b5b9..6416e67 100644
--- a/src/backgroundhelper.cpp
+++ b/src/backgroundhelper.cpp
@@ -39,7 +39,12 @@ void BackgroundHelper::setColor(QColor c)
 {
     m_color = c;
     m_type = 1;
-    emit newColor(c, c.lightness());
+
+    bool isDark = (c.red() * 0.299 +
+                   c.green() * 0.587 +
+                   c.blue() * 0.114) < 186;
+
+    emit newColor(c, isDark);
 }
 
 void BackgroundHelper::setBackgound(const QString &fileName)
@@ -75,8 +80,13 @@ void BackgroundHelper::setBackgound(const QString &fileName)
     sumB /= measureArea;
 
     QColor c = QColor(sumR, sumG, sumB);
+    QColor textColor = (sumR * 0.299 +
+                        sumG * 0.587 +
+                        sumB * 0.114) > 186 ? "#000000" : "#FFFFFF";
+
+    qDebug() << c << textColor;
 
-    emit newColor(c, c.lightness());
+    emit newColor(c, textColor == "#FFFFFF");
 
     // clear cache.
     QPixmapCache::clear();
diff --git a/src/backgroundhelper.h b/src/backgroundhelper.h
index 52e2967..04d65b2 100644
--- a/src/backgroundhelper.h
+++ b/src/backgroundhelper.h
@@ -38,7 +38,7 @@ private slots:
     void onChanged();
 
 signals:
-    void newColor(QColor color, int lightness);
+    void newColor(QColor color, bool darkMode);
 
 private:
     int m_statusBarHeight;