diff --git a/src/utils/MatHelper.php b/src/utils/MatHelper.php
index cae69b2..69c5b57 100644
--- a/src/utils/MatHelper.php
+++ b/src/utils/MatHelper.php
@@ -24,12 +24,12 @@ class MatHelper{
     /**
      * 十六进制颜色 转换为 浮点数颜色
      */
-    static function hex2floatColor($hexColor, $scale = 1){
+    static function hex2floatColor($hexColor, $scale = 1, $gamma = 2.2){
         $floatColor = '';
         $hexColor = trim($hexColor);
-        $r = (hexdec(substr($hexColor, 1, 2))/255) ** 2.2 * $scale;
-        $g = (hexdec(substr($hexColor, 3, 2))/255) ** 2.2 * $scale;
-        $b = (hexdec(substr($hexColor, 5, 2))/255) ** 2.2 * $scale;
+        $r = (hexdec(substr($hexColor, 1, 2))/255 * $scale) ** $gamma;
+        $g = (hexdec(substr($hexColor, 3, 2))/255 * $scale) ** $gamma;
+        $b = (hexdec(substr($hexColor, 5, 2))/255 * $scale) ** $gamma;
         $floatColor = "$r $g $b";
         return $floatColor;
     }