How to make the most of the Full Page Zoom app
The Full Page Zoom app has multiple features which you can tune to integrate perfectly with your Shopify store.
If your product vendor provides high-quality images, use them. If it doesn't or if you build your own products, invest in preparing awesome pictures. Shopify provides a fantastic guide on how to do it at https://www.shopify.com/guides/product-photography where it also explains the reasons why having good images is critical to improving your sales.
In both cases, don't worry about the image sizes: always upload the largest image available to Shopify. Shopify will automatically take care of the product image sizes, making copies of the images in different resolutions.
Full Page Zoom can use those different image sizes, just select in the app preferences page the one which looks best in your store:
On the other hand, if for some reason you cannot upload high-quality images to your store, you may want to select a smaller image size and enable the following option to prevent blurring:
In that case, you can configure different 'Overlay' options to make it look more integrated with your Shopify theme.
Please feel free to play with the different app options and don't hesitate to contact us if you need any assistance with the app.