Following this answer to my SuperUser post, I use Sejda to maximize the crop box without cutting any page content. But into which box ought I enter the margins? As I questioned in that post:
I must print PDFs over 500 pages and with footnotes. All pages are bordered by white blank space, but the white blank space start at different lengths from the border. To wit, the cutoff and dimensions of the text and images differ for each page.
It's too inefficient to measure the cutoff of white blank space on each page. How can I deduce the maximum crop size that'd eliminate the most white space, without cropping the text?