Quote Originally Posted by philip937 View Post
the image can be any size... however to get the zoom effect the size for your product info image size needs to be set smaller than the actual image size (if only using the one size image or small and medium. if you also use large images, it will use the large image for zooming and medium or small for the product info page main image).
Not really. You don't have to that.

I am not using small, medium & large images. Only one image. When it comes to production time, it does not make any sense dealing with all that extra work.

What I have done is to change my "tpl_product_info_display.php" with <div>s limiting the size of the main product image.