From c0e42b5666d457cacac373e9de5e4b5de8a01848 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Mon, 1 Apr 2013 15:21:19 +0000
Subject: [PATCH] Preserve alpha in WP_Image_Editor_GD when images are not
 resized.

Props joehoyle
see #23039


git-svn-id: https://develop.svn.wordpress.org/trunk@23884 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/class-wp-image-editor-gd.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/wp-includes/class-wp-image-editor-gd.php b/wp-includes/class-wp-image-editor-gd.php
index 050e69685e..904cecd876 100644
--- a/wp-includes/class-wp-image-editor-gd.php
+++ b/wp-includes/class-wp-image-editor-gd.php
@@ -97,6 +97,11 @@ class WP_Image_Editor_GD extends WP_Image_Editor {
 		if ( ! $size )
 			return new WP_Error( 'invalid_image', __('Could not read image size.'), $this->file );
 
+		if ( function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
+			imagealphablending( $this->image, false );
+			imagesavealpha( $this->image, true );
+		}
+
 		$this->update_size( $size[0], $size[1] );
 		$this->mime_type = $size['mime'];