Ahhh now I see.
I've just realised that basically, no.
I think that in order to get the dimensions of an image, the server would have to fully download it and then analyse it as the information isn't included in the http headers. That would drain the destination server's bandwidth and take a lot longer.
My only real suggestion is to load up the images you want to include in a web browser, right click them and click properties, and see the dimensions there.
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