From 8774d3c79660038b1051f6586729728db3981754 Mon Sep 17 00:00:00 2001
From: Rafael Kassner <kassner@gmail.com>
Date: Wed, 17 May 2017 08:31:37 +0000
Subject: [PATCH] Keep transparency when resizing images

---
 lib/internal/Magento/Framework/Image/Adapter/Gd2.php       | 4 ++++
 .../Magento/Framework/Image/Adapter/ImageMagick.php        | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/lib/internal/Magento/Framework/Image/Adapter/Gd2.php b/lib/internal/Magento/Framework/Image/Adapter/Gd2.php
index c723ad48ba3d6..8bb76b6b94609 100644
--- a/lib/internal/Magento/Framework/Image/Adapter/Gd2.php
+++ b/lib/internal/Magento/Framework/Image/Adapter/Gd2.php
@@ -346,6 +346,10 @@ public function resize($frameWidth = null, $frameHeight = null)
             $newImage = imagecreate($dims['frame']['width'], $dims['frame']['height']);
         }
 
+        if ($isAlpha) {
+            $this->_saveAlpha($newImage);
+        }
+
         // fill new image with required color
         $this->_fillBackgroundColor($newImage);
 
diff --git a/lib/internal/Magento/Framework/Image/Adapter/ImageMagick.php b/lib/internal/Magento/Framework/Image/Adapter/ImageMagick.php
index 93339dd8e800d..63fe81f41cc2a 100644
--- a/lib/internal/Magento/Framework/Image/Adapter/ImageMagick.php
+++ b/lib/internal/Magento/Framework/Image/Adapter/ImageMagick.php
@@ -168,6 +168,13 @@ public function resize($frameWidth = null, $frameHeight = null)
             );
         }
 
+        $newImage->compositeImage(
+            $this->_imageHandler,
+            \Imagick::COMPOSITE_COPYOPACITY,
+            $dims['dst']['x'],
+            $dims['dst']['y']
+        );
+
         $newImage->compositeImage(
             $this->_imageHandler,
             \Imagick::COMPOSITE_OVER,