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The question is simple:
Should I add bin/magento catalog:images:resize to our Continuous Integration script, running it on every deployment? Or is it's intent solely to run incidentally (since resized and cached images are also generated upon saving a product)?
Also: does it re-generate all images every time you run it? Or does it detect images that are already resized / cached properly and skips those?
Only incidentally.
Generally, product images are cached while saving the product. However, the magento catalog:images:resize command enables you to resize all images for display on your storefront. Situations where this could be necessary might be:
- After you import products, which might have images of various sizes
- If images were resized or deleted manually from cache
Each image assigned to a product must be resized in accordance with image metadata defined in a module’s
view.xmlconfiguration file. After resizing an image, its resized copy is stored in the cache (/pub/media/catalog/product/cachedirectory). Magento serves storefront images from cache.
