From d10858bb6603f033a986607c02fce1e2b170aa1d Mon Sep 17 00:00:00 2001
From: Oliver Vogel <oliver@olivervogel.net>
Date: Wed, 16 Apr 2014 20:03:22 +0200
Subject: [PATCH] bugfix

---
 src/Intervention/Image/Image.php | 3 +++
 tests/ImageTest.php              | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/Intervention/Image/Image.php b/src/Intervention/Image/Image.php
index 53f3081d..b7b3e50a 100644
--- a/src/Intervention/Image/Image.php
+++ b/src/Intervention/Image/Image.php
@@ -1868,6 +1868,9 @@ class Image
     private function cloneResource($resource)
     {
         $clone = imagecreatetruecolor($this->width, $this->height);
+        imagealphablending($clone, false);
+        imagesavealpha($clone, true);
+        
         imagecopy($clone, $resource, 0, 0, 0, 0, $this->width, $this->height);
 
         return $clone;
diff --git a/tests/ImageTest.php b/tests/ImageTest.php
index ea7d6b05..ac145f86 100644
--- a/tests/ImageTest.php
+++ b/tests/ImageTest.php
@@ -1489,6 +1489,15 @@ class ImageTest extends PHPUnit_Framework_Testcase
         $this->assertEquals('#00ff00', $img->pickColor(0, 0, 'hex'));
     }
 
+    public function testBackupKeepTransparency($value='')
+    {
+        $img = new Image('public/circle.png');
+        $img->backup();
+        $img->reset();
+        $transparent = array('r' => 0, 'g' => 0, 'b' => 0, 'a' => 0.0);
+        $this->assertEquals($transparent, $img->pickColor(0, 0, 'array'));
+    }
+
     public function testLimitColors()
     {
         // reduce colors