in /customer/main/product.tpl I change image_x=150 and image_y=150, but somehow it's still distorted. Have you guys tried using PHP GD or has anyone tried using PHP GD to manipulate image quality? There are so many images uploaded already in the site, It will take so long to edit each of them using a graphic editor.
http://www.dingca.com/store/product.php?productid=16455&cat=301&page=1