Sorry for wasting your time, I was friggin' blind :
put <!--<img src='{$image->size(1600, 550, 100)->url}' alt='{$image->description}' width='1600' height ='550'>-->
to <img src='{$image->size(1600, 550, 100)->url}' alt='{$image->description}' width='1600' height ='550'>
and it works fine.