diff --git a/src/libpoketube/ptutils/libpt-coreutils.js b/src/libpoketube/ptutils/libpt-coreutils.js
index bd156706..c4787820 100644
--- a/src/libpoketube/ptutils/libpt-coreutils.js
+++ b/src/libpoketube/ptutils/libpt-coreutils.js
@@ -72,6 +72,25 @@ function getRandomInt(min, max) {
     return Math.floor(Math.random() * (max - min + 1)) + min;
 }
 
+function increase_brightness(hex, percent){
+    // strip the leading # if it's there
+    hex = hex.replace(/^\s*#|\s*$/g, '');
+
+    // convert 3 char codes --> 6, e.g. `E0F` --> `EE00FF`
+    if(hex.length == 3){
+        hex = hex.replace(/(.)/g, '$1$1');
+    }
+
+    var r = parseInt(hex.substr(0, 2), 16),
+        g = parseInt(hex.substr(2, 2), 16),
+        b = parseInt(hex.substr(4, 2), 16);
+
+    return '#' +
+       ((0|(1<<8) + r + (256 - r) * percent / 100).toString(16)).substr(1) +
+       ((0|(1<<8) + g + (256 - g) * percent / 100).toString(16)).substr(1) +
+       ((0|(1<<8) + b + (256 - b) * percent / 100).toString(16)).substr(1);
+}
+
 module.exports = {
 IsJsonString,
 convert,