I don't know if you take suggestions, but it would be a nice addition to the crop function:
in some pdfs there is more whitespace towards the neck of the 'book' meaning that e.g. for even pages there is more white space on the right and for odd pages there is more on the left page.
It would be cool if there'd be an option to specify the to-be cropped region of pages in dependance to the page number. The simplest way would be an option for the user to distinguish between even and odd pages. A general solution would be if the user could specify a formula e.g. 2*n = [2,4,6,...] or 2*n - 1 = [1,3,5,...] which determines which pages should be cropped in which way. If multiple crop regions are specified which are assigned to the same page, the one declared first could take precedence. Negative page numbers could be ignored.
Just a thought. In any case thanks for this tool, it really has helped me over the years.
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