diff --git a/Adapter/GD.php b/Adapter/GD.php
index b0fcac7..a088985 100644
--- a/Adapter/GD.php
+++ b/Adapter/GD.php
@@ -102,7 +102,10 @@ public function crop($x, $y, $width, $height)
         $destination = imagecreatetruecolor($width, $height);
         imagealphablending($destination, false);
         imagesavealpha($destination, true);
-        imagecopy($destination, $this->resource, 0, 0, $x, $y, $this->width(), $this->height());
+        // keep transparency
+        // http://stackoverflow.com/questions/279236/how-do-i-resize-pngs-with-transparency-in-php
+//        imagecopy($destination, $this->resource, 0, 0, $x, $y, $this->width(), $this->height());
+        imagecopyresampled($destination, $this->resource, 0, 0, $x, $y, $this->width(), $this->height(), $this->width(), $this->height());
         imagedestroy($this->resource);
         $this->resource = $destination;