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for wipe
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If content is very light or sparse it may be better to not wipe at all
than wipe almost all of the content leaving a small strip. This is done
now by aborting the wipe if the detected content takes up less than the
minimum % of the page (default is 30%).
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Surprisingly opening an image takes a significant amount of the
total processing time, so this actually saves quite a bit of time
in the grand scheme of things.
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cmds as they were defined in global package space
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Also unify everything else under preproc/
Note that the UsefulImg interface should be used by the main
functions, to simplify things, but this hasn't been done yet.
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