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I scanned in a booklet, and now I have a tif file with "pages" composed of two real pages each, in the order 6/7,5/8,4/9,3/10,2/11,1/12. Is there a way (tool, imagemagick command, etc.) to slice each "page" in half without having to crop each manually twice?

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If the pages have to be split in the middle, you can use ImageMagick as follows:

-crop 50%x100% +repage

The general syntax is -crop geometry{@}{!} explained here. Cut out one or more rectangular regions of the image.

You can also use +repage (explained here) after cropping to remove the page offset that will be left behind.

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