Quote:
Originally Posted by Kuang-che Wu
FYI, my solution is a little inconvenient - the preview is upside-down.
- if used with -cbox/-ibox options, k2pdfopt's GUI let me select the region at 0 degree and I have to swap the values due to -rt 90. I guess other options have similar problems.
Hope this could convince you to modify k2pdfopt 
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I'd rotate the whole thing before and after you process it, e.g.
Code:
k2pdfopt -mode copy -n -rt 90 srcfile.pdf
... before processing, and ...
Code:
k2pdfopt -mode copy -n -rt -90 processed_file.pdf
... after processing.