[Bug-ocrad] Question on new rotate option

[Tony Maro]

I'm using:

ocrad --crop 700,960,1640,2200 -t rotate180

But I've learned that some of my pages are smaller than others because
the scanners automatically size the image according to the paper.

Is there a way to reference the coords from the lower right corner?  I
don't need exactly the quadrant of the page, I'm actually using a bit
more than that.

Thanks,
Tony Maro