diff -r 8acdf12aa016 -r e6605fecb175 client/annotviz/app/js/utils.js
--- a/client/annotviz/app/js/utils.js	Thu Jan 22 11:18:58 2015 +0100
+++ b/client/annotviz/app/js/utils.js	Thu Jan 22 12:12:33 2015 +0100
@@ -14,7 +14,14 @@
 	return ((hours < 10 ? '0' + hours : hours) + ':' + (minutes < 10 ? '0' + minutes : minutes) + ':' + (seconds  < 10 ? '0' + seconds : seconds));
 }
 
+function colorToHex(c) {
+	var m = /rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/.exec(c);
+	return m ? '#' + (1 << 24 | m[1] << 16 | m[2] << 8 | m[3]).toString(16).substr(1) : c;
+}
+
+
 
 module.exports = {
-	formatTime: formatTime
+	formatTime: formatTime,
+	colorToHex: colorToHex
 };