I changed it to use pixelfields. In fact it uses the same code as crop
action where possible. I implemented AbstractCrop containing the common
functionality. Note that it is missing the "auto" alternative as I did
not figure out how to implement it for photos. :)

** Attachment added: "lossless_jpeg6.txt"
   http://launchpadlibrarian.net/28026603/lossless_jpeg6.txt

-- 
Implementation of "lossless editing of jpeg pictures"
https://bugs.launchpad.net/bugs/388371
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Status in Phatch = Photo & Batch!: Incomplete

Bug description:
This patch implements 
https://blueprints.launchpad.net/phatch/+spec/jpeg-lossless-editing . Note that 
I did not expose absolutely every option of either exiftran or jpegtran. More 
can be exposed as needed.

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