Ticket #54476: 54476.diff

src/wp-includes/media.php

@@ -3751 +3751 @@
                 }
         }
 
+        /** This filter is documented in wp-includes/class-wp-image-editor.php */
+        $output_format = apply_filters( 'image_editor_output_format', array(), $path, $args['mime_type'] );
+        if ( isset( $output_format[ $args['mime_type'] ] ) ) {
+                $args['mime_type'] = $output_format[ $mime_type ];
+        }
+
         $implementation = _wp_image_editor_choose( $args );
 
         if ( $implementation ) {