Hi,
Please go to BO > Improve > Design > Image setting, you can change the dimension of “superlarge_default” and regenerate thumbnails for it.
Best regards.
Hi,
You can go to BO > Modules > Theme editor > Product pages, change the width of main product image column to change the dimension also.
Best regards.
Hi,
I would like to explain your needs: there is a main product image a.jpg on product pages, if you move mouse on it, the zoom image will be b.jpg, is it your wanted ?
Best regards.
Hi,
Unfortunately, it is impossible. As the image code is generated dynamically, when you click the thumbnails, the new image will be generated by Prestashop.
Best regards.