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Imagemagick is a cross-platform image editing program that uses a scripting language to create, edit, and convert between over 200 different image formats. It can be run in various forms including a command-line program, invoked as an object, as a PHP module, and various others.

Useful Scripts

Make a Picture Book

This script will take a folder full of JPEGs and make a PDF document out the them where each page of the PDF has a single image centered on the page. The page size specified here yields a standard letter size (8.5" x 11") at 72 DPI.

magick *.jpg -gravity center -extent 612x792 -density 72 output.pdf