The problem with the iPad is not the size of the pic, but the size of the pic it will email! If you send the pic from "camera roll", using the little icon at the bottom left, you have an option to send the picture full size. This can be done from email too, but you have to monkey around with the BCC: line in the email address to expose the size option.
(This is what I HATE about Apple products -- it's rather complicated to do anything Apple didn't think you really ought to want to do -- like save a web page!)
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