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Not exactly sure about your question, but sounds like you want to crop at a given aspect ratio each time. For example, you are starting out with 1600x1200, which is 4x3. If you want to keep this (or change it), just do what nick said, but instead of using pixels use inches and put in 4 and 3 (or whatever ratio you want). This will allow you to size the crop up or down but only at that certain ratio. That what you wanted?
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