imagemagick for thumbnail

I would like user to upload most of their photo albu开发者_如何学Goms online, would it feasible to create and save one in thumbnails folder and one in full size folder or generate thumbnails on the fly when the user access their album? It will be something like eBay does. Webspace is not a concern since I have an unlimited plan.

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Store the thumbnails when they're uploaded, or better yet, create a thumbnail (and store it) when the image is first accessed.

Storing them means that the server won't have to do unnecessary processing on every page load.