img2pdf: Merge and resize images into a PDF
I was recently emailed a bunch of JPEG files of a scanned document. There was a file for every page, and the image files were very large. I wanted to get them all in a single PDF file on letter size paper. Because I find PDF mystical and difficult to work with, I decided to stick to tools I know - and I know LaTeX.
In no time I learned how to use the ImageMagick tool
convert to convert to PDF.
Assuming that our original files are named
page2.jpg, etc. I could do:
convert page* -format pdf merge.pdf
However, this made a PDF sized to the images, rather than forcing a letter size page.
Instead, I did the following.
First, I resized the images to something reasonable using
convert (they were insanely large).
convert page* -resize 50% -format jpg page.jpg
This created files
page-4.jpg with smaller sizes.
Then I wrote the following script, which I called
img2pdf which takes images files as arguments and converts to PDF.
Save the GitHub gist to a file and mark it as executable.
img2pdf -h has usage instructions, but it’s simple enough to figure out.