Build PDF from images with ImageMagick
If you scanned a bunch of documents in from paper and you want to easily combine them into a single PDF, you can use ImageMagick’s convert command.
Place all of your files in a directory and give them sequential names (001.tif, 002.tif, 003.tif, etc) and then run this command:
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convert -compress JPEG -adjoin *.tif pdf:all_these_files_in_one.pdf