imagesavealpha() in Element\Image

2016-04-11 12:49:18 -05:00 · 2016-04-11 12:49:18 -05:00 · f4ec74a4c5
parent adfcc62e64
commit f4ec74a4c5
1 changed files with 4 additions and 0 deletions
--- a/src/PhpWord/Element/Image.php
+++ b/src/PhpWord/Element/Image.php
@ -335,6 +335,10 @@ class Image extends AbstractElement
        // Read image binary data and convert to hex/base64 string
        if ($this->sourceType == self::SOURCE_GD) {
            $imageResource = call_user_func($this->imageCreateFunc, $actualSource);
+            if ($this->imageType === 'image/png') {
+                // PNG images need to preserve alpha channel information
+                imagesavealpha($imageResource, true);
+            }
            ob_start();
            call_user_func($this->imageFunc, $imageResource);
            $imageBinary = ob_get_contents();