The fix is simply to set the width/height size larger then you would ever need and let the resize script do its job...
in includes/modules/pages/product_info/jscript_main.php
find and change in red was 100 to 1000
Code:
function popupWindow(url) {
window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width=1000,height=1000,screenX=150,screenY=150,top=150,left=150')
}
The resize script well decrees the window to the image true size based on the screen size and so on... basically the same thing I do in colorbox..
tested with ZC156a responsive classic template with the added img css for max-width set to 100%
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