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URL	web address up to number. If first image http://abc.com/im123.jpg use http://abc.com/im
From	what number to start?
To	what number to finish?
Padding	how many places does number use? If image0001.jpg then use 4. If no zero padding use 1.
Extension	what comes after the number? if im123abc.jpg use abc.jpg. If image123.png use .png