Save alpha channel when downloading PNG images

Fixes #2805

Signed-off-by: Kevin Decherf <kevin@kdecherf.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/Wallabag/CoreBundle/Helper/DownloadImages.php b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
index c83f9618..0d330d2a 100644
--- a/src/Wallabag/CoreBundle/Helper/DownloadImages.php
+++ b/src/Wallabag/CoreBundle/Helper/DownloadImages.php
@@ -144,6 +144,8 @@ class DownloadImages
                 $this->logger->debug('DownloadImages: Re-creating jpg');
                 break;
             case 'png':
+                imagealphablending($im, false);
+                imagesavealpha($im, true);
                 imagepng($im, $localPath, ceil(self::REGENERATE_PICTURES_QUALITY / 100 * 9));
                 $this->logger->debug('DownloadImages: Re-creating png');
         }