#DjVu tip: #pdf2djvu is not smart enough to work out whether a doc is monochrome (bitonal). Use the --monochrome option & your doc will be ⅕ of the size without the option.

When using #pdf2djvu & neglecting to put a “-o” ahead of the output filename, it says “I won't write DjVu data to a terminal.” Thank you! So many CLI tools wouldn’t give a shit and just take a massive binary shit on your terminal & leave it in a dysfunctional state (while blaming the user).