1 files changed, 12 insertions, 2 deletions
diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/ColorUtil.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/ColorUtil.java
index f086712e..d701313f 100644
--- a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/ColorUtil.java
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/ColorUtil.java
@@ -49,11 +49,21 @@ public class ColorUtil {
 	}
 
 	public static float getBrightness(Color color) {
-		return Color.RGBtoHSB(color.getRed(), color.getBlue(), color.getGreen(), null)[2];
+		float a[] = new float[3];
+		color.getRGBColorComponents(a);
+		return a[0] * 0.2126f + a[1] * 0.7152f + a[2] * 0.0722f;
+	}
+	
+	public static float getContrast(Color a, Color b) {
+		float val = (getBrightness(a) + 0.05f) / (getBrightness(b) + 0.05f);
+		if (val < 1) {
+			val = 1 / val;
+		}
+		return val;
 	}
 
 	public static Color contrastColor(Color color) {
 		return new Color(color.getRed() ^ 0x80, color.getGreen() ^ 0x80, color.getBlue() ^ 0x80);
 	}
-
+	
 }