diff --git a/enabler/src/de/schildbach/pte/dto/Style.java b/enabler/src/de/schildbach/pte/dto/Style.java
index 92787599..4c036098 100644
--- a/enabler/src/de/schildbach/pte/dto/Style.java
+++ b/enabler/src/de/schildbach/pte/dto/Style.java
@@ -125,4 +125,16 @@ public class Style implements Serializable
 	{
 		return color & 0xff;
 	}
+
+	public static int deriveForegroundColor(final int backgroundColor)
+	{
+		// formula for perceived brightness computation: http://www.w3.org/TR/AERT#color-contrast
+		final double a = 1 - (0.299 * Style.red(backgroundColor) + 0.587 * Style.green(backgroundColor) + 0.114 * Style.blue(backgroundColor)) / 255;
+
+		// dark colors, white font. Or light colors, black font
+		if (a >= 0.5)
+			return WHITE;
+		else
+			return BLACK;
+	}
 }
diff --git a/enabler/test/de/schildbach/pte/dto/StyleTest.java b/enabler/test/de/schildbach/pte/dto/StyleTest.java
index 29a1320a..a441cca7 100644
--- a/enabler/test/de/schildbach/pte/dto/StyleTest.java
+++ b/enabler/test/de/schildbach/pte/dto/StyleTest.java
@@ -32,4 +32,42 @@ public class StyleTest
 		final int color = Style.parseColor("#123456");
 		assertEquals(color, Style.rgb(Style.red(color), Style.green(color), Style.blue(color)));
 	}
+
+	@Test
+	public void deriveForegroundColorForLightBackground()
+	{
+		final int acacia = Style.rgb(205, 200, 63);
+		final int lilac = Style.rgb(197, 163, 202);
+		final int mint = Style.rgb(121, 187, 146);
+		final int ochre = Style.rgb(223, 176, 57);
+		final int orange = Style.rgb(222, 139, 83);
+		final int ranunculus = Style.rgb(242, 201, 49);
+		final int rose = Style.rgb(223, 154, 177);
+		final int vinca = Style.rgb(137, 199, 214);
+
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(acacia));
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(lilac));
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(mint));
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(ochre));
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(orange));
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(ranunculus));
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(rose));
+		assertEquals(Style.BLACK, Style.deriveForegroundColor(vinca));
+	}
+
+	@Test
+	public void deriveForegroundColorForDarkBackground()
+	{
+		final int azure = Style.rgb(33, 110, 180);
+		final int brown = Style.rgb(141, 101, 56);
+		final int iris = Style.rgb(103, 50, 142);
+		final int parme = Style.rgb(187, 77, 152);
+		final int sapin = Style.rgb(50, 142, 91);
+
+		assertEquals(Style.WHITE, Style.deriveForegroundColor(azure));
+		assertEquals(Style.WHITE, Style.deriveForegroundColor(brown));
+		assertEquals(Style.WHITE, Style.deriveForegroundColor(iris));
+		assertEquals(Style.WHITE, Style.deriveForegroundColor(parme));
+		assertEquals(Style.WHITE, Style.deriveForegroundColor(sapin));
+	}
 }