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Product images are the vital source for driving sales in E-commerce. In Magento 2, store owners need to combine them with different themes and it’s difficult to make product images look good on all of them. As a part of this process, the admin may require to change the default product image size in Magento 2 store.
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For more information visit: https://meetanshi.com/blog/change-default-product-image-size-in-magento-2/
Magento 2 product image size and other image options are defined in <theme_dir>/etc/view.xml. Themes located in app/design/frontend/<Vendor>/ folder. But magento built-in themes can be located in vendor/magento/theme-frontend-<theme_code> when you install it from the composer repository. /etc/view.xml contains images configuration for all storefront product images and thumbnails. This file is required for a theme, but optional if exists in the parent theme. If your theme does not have /etc/view.xml, you can check parent theme. Parent theme is declared in <theme_dir>/theme.xml.
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