From d7e1222efc460b420ac396ee3b68addc234a3cd4 Mon Sep 17 00:00:00 2001
From: Matthias Schmidt <gravatronics@live.com>
Date: Sat, 5 Nov 2016 15:08:50 +0100
Subject: [PATCH] Fix opacity issue when writing images with GD

---
 .../files/lib/system/image/adapter/GDImageAdapter.class.php     | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php b/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php
index edc253aff8..0410dc387e 100644
--- a/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php
+++ b/wcfsetup/install/files/lib/system/image/adapter/GDImageAdapter.class.php
@@ -326,6 +326,8 @@ class GDImageAdapter implements IImageAdapter {
 		
 		ob_start();
 		
+		imagealphablending($image, false);
+		imagesavealpha($image, true);
 		if ($this->type == IMAGETYPE_GIF) {
 			imageGIF($image);
 		}
-- 
2.20.1