ImageMagick

Screenshots⚑

Make a screenshot of a selection⚑

import

(https://unix.stackexchange.com/questions/233345/how-can-i-easily-make-screenshots-of-screen-regions-on-arch-linux-with-i3-wm)

Conversions⚑

Image to PDF⚑

convert .pdf

(https://stackoverflow.com/questions/8955425/how-can-i-convert-a-series-of-images-to-a-pdf-from-the-command-line-on-linux)

Resize and compress⚑

Resize an image to width 1000 px and compress it with a JPG quality level of 80% in place:

mogrify -quality 1000 -resize 80 file.jpg