I have a site that lets a user create multiple galleries. For each gallery they can upload an image to be the image for that gallery.

I want to generate a thumbnail for each gallery to display on a page, however depending on the template they have selected (in another part of the control panel) the thumbnails should be a different size.

Am I better off generating the thumbnails (either using PHPThumb or the GD library) on the fly each time this page is loaded or should I generate the thumbs as the gallery is created and then re-generate all of the current thumbs if/when they change their template?

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