Optimal steps I believe are:

    - rotate        (with input)
    - crop          (with input)
    - scale
    - upload
    - full size:
        - sharpen   (with input)
    - thumbnail:
        - scale
        - sharpen

details:
    - rotate should be BEFORE crop, since that's the only way to ensure rectangular output
    - rotate/crap can be combined from the user perspective, since they can
            specify a rotated rectangle
    - to minimize upload sizes, rotate/crap/scale is done before, and sharpen
            is done after.