Fix opacity issue when writing images with GD

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 edc253aff8eb433e24f06b51cacd5c8b8c0fc3a3..0410dc387ed76f040a339b46fd3ef444968b9c2c 100644 (file)
--- 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);
                }