Just stumbled upon the following page while traversing the periphery of your similar predicament. You might want to check. Have not tried it yet, though.

http://www.rdrop.com/~half/General/Downloads/imgdim.pl

This issue, I just found out, has also been discussed here.

In reply to Re^3: jpg file demensions by AJRod
in thread jpg file demensions by kmarshall

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