Admin - Configuration - Images - Image Suffix Medium - Catalog

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Menu: Admin - Configuration - Images - Image Suffix Medium - Catalog

/path/to/your/shop/includes/modules/main_product_image.php

Line #15 : $products_image_medium = $products_image_base . IMAGE_SUFFIX_MEDIUM . $products_image_extension;

/path/to/your/shop/includes/modules/pages/popup_image/header_php.php

Line #41 : $products_image_medium = $products_image_base . IMAGE_SUFFIX_MEDIUM . $products_image_extension;

/path/to/your/shop/includes/modules/pages/popup_image_additional/header_php.php

Line #33 : $products_image_medium = $products_image_base . IMAGE_SUFFIX_MEDIUM . $products_image_extension;