"I often am forced to savagely criticize posters on Usenet binary
groups for posting scans at 150 dpi or even 300 dpi. I will
assail them severely for not using at least 600 dpi and they
do not appreciate it -- until they see the results."
Right side of your piehole:
Aug 2017 Epson scanner script
"scanimage ... --resolution 300 "
May 2020 HP scanner script
"scanimage ... --resolution 300 "