diff --git a/src/utils/MatHelper.php b/src/utils/MatHelper.php
index 7613e66..19aaf09 100644
--- a/src/utils/MatHelper.php
+++ b/src/utils/MatHelper.php
@@ -230,9 +230,9 @@ class MatHelper{
     static function hex2floatColor($hexColor){
         $floatColor = '';
         $hexColor = trim($hexColor);
-        $r = (hexdec(substr($hexColor, 1, 2))/255) ** (1/2.2);
-        $g = hexdec(substr($hexColor, 3, 2))/255 ** (1/2.2);
-        $b = hexdec(substr($hexColor, 5, 2))/255 ** (1/2.2);
+        $r = (hexdec(substr($hexColor, 1, 2))/256) ** 2.2;
+        $g = (hexdec(substr($hexColor, 3, 2))/256) ** 2.2;
+        $b = (hexdec(substr($hexColor, 5, 2))/256) ** 2.2;
         $floatColor = "$r $g $b";
         return $floatColor;
     }